W78IRD2 Datasheet PDF - nuvoton

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W78IRD2
nuvoton

Part Number W78IRD2
Description 8-BIT MICROCONTROLLER
Page 30 Pages


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W78IRD2 Data Sheet
Table of Contents-
8-BIT MICROCONTROLLER
1. GENERAL DESCRIPTION .......................................................................................................... 3
2. FEATURES.................................................................................................................................. 3
3. PIN CONFIGURATIONS ............................................................................................................. 4
4. PIN DESCRIPTION ..................................................................................................................... 5
5. FUNCTIONAL DESCRIPTION .................................................................................................... 6
5.1 RAM ................................................................................................................................ 6
5.2 Timers/Counters.............................................................................................................. 6
5.3 Clock ............................................................................................................................... 7
5.4 Power Management ........................................................................................................ 7
5.5 Reduce EMI Emission ..................................................................................................... 7
5.6 Reset ............................................................................................................................... 7
6. SPECIAL FUNCTION REGISTER .............................................................................................. 8
7. PORT 4 AND BASE ADDRESS REGISTERS .......................................................................... 30
8. INTERRUPTS............................................................................................................................ 32
8.1 External Interrupts 2 and 3 ............................................................................................ 32
8.2 Interrupt Priority............................................................................................................. 32
9. PROGRAMMABLE TIMERS/COUNTERS ................................................................................ 33
9.1 Timer 0 and Timer 1...................................................................................................... 33
9.2 Timer/Counter 2 ............................................................................................................ 35
10. ENHANCED FULL DUPLEX SERIAL PORT ............................................................................ 38
10.1 MODE 0......................................................................................................................... 38
10.2 MODE 1......................................................................................................................... 39
10.3 MODE 2......................................................................................................................... 40
10.4 MODE 3......................................................................................................................... 41
10.5 Framing Error Detection ................................................................................................ 42
10.6 Multi-Processor Communications ................................................................................. 42
11. PROGRAMMABLE COUNTER ARRAY (PCA) ......................................................................... 44
11.1 PCA Capture Mode ....................................................................................................... 47
11.2 16-bit Software Timer Comparator Mode...................................................................... 48
11.3 High Speed Output Mode.............................................................................................. 48
11.4 Pulse Width Modulator Mode ........................................................................................ 49
11.5 Watchdog Timer............................................................................................................ 50
12. HARDWARE WATCHDOG TIMER (ONE-TIME ENABLED WITH RESET-OUT) ................... 51
13. DUAL DPTR .............................................................................................................................. 51
14. TIMED-ACCESS PROTECTION............................................................................................... 52
Publication Release Date: October 2, 2006
- 1 - Revision A7



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W78IRD2
15. IN-SYSTEM PROGRAMMING (ISP) MODE ............................................................................. 54
16. H/W REBOOT MODE (BOOT FROM LDROM) ........................................................................ 58
17. OPTION BITS REGISTER ........................................................................................................ 59
18. ELECTRICAL CHARACTERISTICS ......................................................................................... 60
18.1 Absolute Maximum Ratings .......................................................................................... 60
18.2 D.C. Characteristics ...................................................................................................... 60
18.3 A.C. Characteristics....................................................................................................... 62
19. TIMING WAVEFORMS ............................................................................................................. 64
20. TYPICAL APPLICATION CIRCUITS......................................................................................... 66
20.1 External Program Memory and Crystal ......................................................................... 66
20.2 Expanded External Data Memory and Oscillator .......................................................... 67
21. PACKAGE DIMENSIONS.......................................................................................................... 68
22. APPLICATION NOTE................................................................................................................ 70
22.1 In-System Programming (ISP) Software Examples ...................................................... 70
22.2 How to Use Programmable Counter Array.................................................................... 74
23. REVISION HISTORY................................................................................................................. 75
-2-



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W78IRD2
1. GENERAL DESCRIPTION
The W78IRD2 is an 8-bit microcontroller which is pin- and instruction-set-compatible with the standard
80C52. The W78IRD2 contains a 64-KB Flash EPROM whose contents may be updated in-system by
a loader program stored in an auxiliary, 4-KB Flash EPROM. Once the contents are confirmed, it can
be protected for security.
The W78IRD2 also contains 256 bytes of on-chip RAM; 1 KB of auxiliary RAM; four 8-bit, bi-directional
and bit-addressable I/O ports; an additional 4-bit port P4; three 16-bit timer/counters; and a serial port.
These peripherals are all supported by nine interrupt sources with 4 levels of priority.
The W78IRD2 has two power-reduction modes: idle mode and power-down mode, both of which are
software-selectable. Idle mode turns off the processor clock but allows peripherals to continue
operating, while power-down mode stops the crystal oscillator for minimum power consumption.
Power-down mode can be activated at any time and in any state without affecting the processor.
2. FEATURES
8-bit CMOS microcontroller
Pin-compatible with standard 80C52
Instruction-set compatible with 80C52
Four 8-bit I/O ports; Port 0 has internal pull-up resisters enabled by software
One extra 4-bit I/O port with interrupt and chip-select functions
Three 16-bit timers
Programmable clock out
Programmable Counter Array (PCA) with PWM, Capture, Compare and Watchdog functions
9 interrupt sources with 4 levels of priority
Full-duplex serial port with framing-error detection and automatic address recognition
64-KB, in-system-programmable, Flash EPROM (AP Flash EPRAOM)
4-KB auxiliary Flash EPROM for loader program (LD Flash EPROM)
256-byte on-chip RAM
1-KB auxiliary RAM, software-selectable
Software Reset
12 clocks per machine cycle operation (default). Speed up to 20 MHz.
6 clocks per machine cycle operation set by the writer. Speed up to 12 MHz.
2 DPTR registers
Low EMI (inhibit ALE)
Built-in power management with idle mode and power down mode
Code protection
Packages:
Lead Free (RoHS) DIP 40: W78IRD2A25DL
Lead Free (RoHS) PLCC 44: W78IRD2A25PL
Publication Release Date: October 2, 2006
- 3 - Revision A7



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W78IRD2
3. PIN CONFIGURATIONS
40-Pin DIP
T2, P1.0
T2EX, P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
RXD, P3.0
TXD, P3.1
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
WR, P3.6
RD, P3.7
XTAL2
XTAL1
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 VDD
39 P0.0, AD0
38 P0.1, AD1
37 P0.2, AD2
36 P0.3, AD3
35 P0.4, AD4
34 P0.5, AD5
33 P0.6, AD6
32 P0.7, AD7
31 EA
30 ALE
29 PSEN
28 P2.7, A15
27 P2.6, A14
26 P2.5, A13
25 P2.4, A12
24 P2.3, A11
23 P2.2, A10
22 P2.1, A9
21 P2.0, A8
44-Pin PLCC
P1.5
P1.6
P1.7
RST
RXD, P3.0
INT2, P4.3
TXD, P3.1
INT0, P3.2
INT1, P3.3
T0, P3.4
T1, P3.5
/
TI
2 N AAAA
ET T
DD D D
X2 3
01 2 3
,, ,
,, , ,
P P P PP P
PP P P
1 1 1 11 4V 00 0 0
. . . . . . D. . . .
4 3 2 10 2D 01 2 3
6 5 4 3 2 1 44 43 42 41 40
7 39
8 38
9 37
10 36
11 35
12 34
13 33
14 32
15 31
16 30
17 29
18 19 20 21 22 23 24 25 26 27 28
PP X XVPPP P P P
33 TTS4 22 2 2 2
. . AAS. . . . . .
67 LL
001 2 3 4
, , 21
,, , , ,
//
AA A A A
WR
89 1 1 1
RD
012
P0.4, AD4
P0.5, AD5
P0.6, AD6
P0.7, AD7
EA
P4.1
ALE
PSEN
P2.7, A15
P2.6, A14
P2.5, A13
-4-



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