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PDF W78C31B Data sheet ( Hoja de datos )
| Número de pieza | W78C31B | |
| Descripción | 8-Bit Microcontroller | |
| Fabricantes | Winbond Electronics | |
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W78C31B
8-BIT MICROCONTROLLER
GENERAL DESCRIPTION
The W78C31B microcontroller supplies a wider frequency range than most 8-bit microcontrollers on
the market. It is compatible with the industry standard 80C31 microcontroller series.
The W78C31B contains four 8-bit bidirectional parallel ports, two 16-bit timer/counters, and a serial
port. These peripherals are supported by a five-source, two-level interrupt capability. There are 128
bytes of RAM, and the device supports ROMless operation for application programs.
The W78C31B microcontroller has two power reduction modes, idle mode and power-down mode,
both of which are software selectable. The idle mode turns off the processor clock but allows for
continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power
consumption. The external clock can be stopped at any time and in any state without affecting the
processor.
FEATURES
• 8-bit CMOS microcontroller
• Fully static design
• Low standby current at full supply voltage
• DC-40 MHz operation
• 128 bytes of on-chip scratchpad RAM
• ROMless operation
• 64K bytes program memory address space
• 64K bytes data memory address space
• Four 8-bit bidirectional ports
• Two 16-bit timer/counters
• One full duplex serial port
• Boolean processor
• Five-source, two-level interrupt capability
• Built-in power management
• Packages:
− DIP 40: W78C31B-16/24/40
− PLCC 44: W78C31BP-16/24/40
− QFP 44: W78C31BF-16/24/40
− TQFP 44: W78C31BM-16/24/40
Publication Release Date: October 1997
- 1 - Revision A3
1 page  
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W78C31B
FUNCTION DESCRIPTION
The W78C31B architecture consists of a core controller surrounded by various registers, four general
purpose I/O ports, 128 bytes of RAM, two timer/counters, and a serial port. The processor supports
111 different instructions and references both a 64K program address space and a 64K data storage
space.
Timers 0, 1
Timers 0, 1, each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0, TL1
and TH1 for Timer 1. The TCON and TMOD registers provide control functions for timers 0, 1.
Clock
The W78C31B is designed to be used with either a crystal oscillator or an external clock. Internally,
the clock is divided by two before it is used. This makes the W78C31B relatively insensitive to duty
cycle variations in the clock.
Crystal Oscillator
The W78C31B incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be
connected across pins XTAL1 and XTAL2. In addition, a load capacitor must be connected from each
pin to ground, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC bias
when the crystal frequency is above 24 MHz.
External Clock
An external clock should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the external clock
signal should have an input one level of greater than 3.5 volts.
Power Management
Idle Mode
The idle mode is entered by setting the IDL bit in the PCON register. In the idle mode, the internal
clock to the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The
processor will exit idle mode when either an interrupt or a reset occurs.
Power-Down Mode
When the PD bit of the PCON register is set, the processor enters the power-down mode. In this
mode all of the clocks, including the oscillator are stopped. The only way to exit power-down mode is
by a reset.
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.
An internal trigger circuit in the reset line is used to deglitch the reset line when the W78C31B is used
with an external RC network. The reset logic also has a special glitch removal circuit that ignores
glitches on the reset line.
Publication Release Date: October 1997
- 5 - Revision A3
5 Page 
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TYPICAL APPLICATION CIRCUIT
Using External Program Memory and Crystal
W78C31B
VCC
10 u
8.2 K
CRYSTAL
C1 C2
31
EA
19 XTAL1
R 18 XTAL2
9 RST
12 INT0
13 INT1
14 T0
15 T1
1 P1.0
2 P1.1
3 P1.2
4 P1.3
5 P1.4
6 P1.5
7 P1.6
8 P1.7
P0.0 39 AD0
P0.1 38 AD1
P0.2 37 AD2
P0.3 36 AD3
P0.4
P0.5
35 AD4
34 AD5
P0.6 33 AD6
P0.7 32 AD7
P2.0 21 A8
P2.1 22 A9
P2.2 23 A10
P2.3 24 A11
P2.4 25 A12
P2.5 26 A13
P2.6 27 A14
P2.7 28 A15
RD 17
WR 16
PSEN 29
ALE
TXD
RXD
30
11
10
AD0 3 D0 Q0 2 A0
AD1 4 D1 Q1 5 A1
AD2 7 D2 Q2 6 A2
AD3 8 D3 Q3 9 A3
AD413 D4 Q4 12 A4
AD514 D5 Q5 15 A5
AD617 D6 Q6 16 A6
AD718 D7 Q7 19 A7
GND 1 OC
11 G
74LS373
A0 10
A1 9
A0
A1
A2
A3
A4
A5
8
7
6
5
A2
A3
A4
A5
A6 4 A6
A7 3 A7
A8 25 A8
A9 24 A9
A10 21
A11 23
A10
A11
A12 2
A13 26
A14 27
A12
A13
A14
A15 1 A15
GND20 CE
22 OE
27512
O0
O1
O2
O3
11
12
13
15
O4 16
O5 17
O6 18
O7 19
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
W78C31B
Figure A
CRYSTAL
16 MHz
24 MHz
33 MHz
40 MHz
C1 C2 R
30P 30P
−
15P 15P
−
10P 10P 6.8K
5P 5P 4.7K
Above table shows the reference values for crystal applications.
Note: C1, C2, R components refer to Figure A.
- 11 -
Publication Release Date: October 1997
Revision A3
11 Page | ||
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