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W78ERD2 데이터시트 PDF




Winbond에서 제조한 전자 부품 W78ERD2은 전자 산업 및 응용 분야에서
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부품번호 W78ERD2 기능
기능 8-BIT MICROCONTROLLER
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W78ERD2 데이터시트, 핀배열, 회로
W78ERD2/W78ERD2A Data Sheet
www.DataSheet4U.com
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 ..................................................................... 47
11.3 High Speed Output Mode ............................................................................................. 48
11.4 Pulse Width Modulator Mode ....................................................................................... 49
11.5 Watchdog Timer ........................................................................................................... 49
12. HARDWARE WATCHDOG TIMER (ONE-TIME ENABLED WITH RESET-OUT) ................... 50
Publication Release Date: February 14, 2007
- 1 - Revision A10




W78ERD2 pdf, 반도체, 판매, 대치품
W78ERD2/W78ERD2A
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 AA A A
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 XV PPP P P P
33 TTS422 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
44-Pin QFP
/
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
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
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 30
5 29
6 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
PP X X V PPP P P P
33 TTS422 2 2 2
. . AAS. . . . . .
67 LL
001 2 3 4
, , 21
,, , , ,
/ / AA A A A
WR
89 1 1 1
RD
0 12
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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W78ERD2 전자부품, 판매, 대치품
W78ERD2/W78ERD2A
Timer 2 is controlled by the T2CON register. Like Timers 0 and 1, Timer 2 can operate as either an
external event counter or an internal timer, depending on the setting of bit C/T2 in T2CON. Timer 2
has three operating modes: capture, auto-reload, and baud rate generator. In capture or auto-reload
mode, RCAP2H and RCAP2L are the reload / capture registers and the clock speed is the same as
that of Timers 0 and 1.
5.3 Clock
The W78ERD2 is designed for either a crystal oscillator or an external clock.
The W78ERD2 incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be
connected across pins XTAL1 and XTAL2, and a load capacitor may be connected from each pin to
ground. In addition, if the crystal frequency is higher than 24 MHz, a resistor should be connected
between XTAL1 and XTAL2 to provide a DC bias.
An external clock is connected to pin XTAL1, while pin XTAL2 should be left disconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the logic-1 voltage
should be higher than 3.5 V.
5.4 Power Management
The W78ERD2 provides two modes, idle mode and power-down mode, to reduce power consumption.
Both modes are entered by software.
The W78ERD2 enters Idle mode when the IDL bit in the PCON register is set. In Idle mode, the
internal clock for the processor stops while the internal clock for the peripherals and interrupt logic
continues to run. The W78ERD2 leaves Idle mode when an interrupt or a reset occurs.
The W78ERD2 enters Power-Down mode when the PD bit in the PCON register is set. In Power-
Down mode, all of the clocks are stopped, including the oscillator. The W78ERD2 leaves Power-Down
mode when there is a hardware reset or by external interrupts INT0 or INT1, if enabled.
5.5 Reduce EMI Emission
If the crystal frequency is less than 25 MHz, set bit 7 in the option register to 0 to reduce EMI
emissions. Please see Option Bits for more information.
5.6 Reset
The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two
machine cycles while the oscillator is running, as the W78ERD2 has a special glitch-removal circuit
that ignores glitches on the reset line.
During reset, the ports are initialized to FFH, the stack pointer to 07H, and all of the other SFR to 00H,
with two exceptions—SBUF does not change, and bit 4 in PCON is not cleared.
Publication Release Date: February 14, 2007
- 7 - Revision A10

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W78ERD2

8-BIT MICROCONTROLLER

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