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W78C31B 데이터시트 PDF




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부품번호 W78C31B 기능
기능 8-Bit Microcontroller
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W78C31B 데이터시트, 핀배열, 회로
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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




W78C31B pdf, 반도체, 판매, 대치품
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W78C31B
PSEN
Program Store Enable Output, active low. PSEN enables the external ROM onto the Port 0
address/data bus during fetch and MOVC operations. PSEN goes to a high state during reset with a
weak pull-up.
XTAL1
Crystal 1. This is the crystal oscillator input. This pin may be driven by an external clock.
XTAL2
Crystal 2. This is the crystal oscillator output. It is the inversion of XTAL1.
VSS, VCC
Power Supplies. These are the chip ground and positive supplies.
BLOCK DIAGRAM
RAM
128
Bytes
CPU
CORE
SFR
Port 0
Port 1
Data Bus
Interrupt
Serial
Port
Timer 0
Timer 1
INT 0
INT 1
Port 2
Port 3
Alternate
-4-

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W78C31B
DC Characteristics, continued
PARAMETER
SYMBOL TEST CONDITIONS
Input Low Voltage P1, P3
VIL1 VDD = 4.5V
Input Low Voltage
XTAL1, RST (*3)
VIL2 VDD = 4.5V
Input High Voltage P1, P3 VIH1 VDD = 5.5V
Input High Voltage
XTAL1, RST (*3)
VIH2 VDD = 5.5V
Notes:
*1. P0 and P2 are in external access mode.
*2. RST pin has an internal pull-down resistor of about 30 K.
*3. XTAL1 is a CMOS input and RST is a Schmitt trigger input.
SPECIFICATION
MIN. TYP. MAX.
--
0.8
0-
0.8
UNIT
V
V
2.4 - VDD+0.2 V
3.5 - VDD+0.2 V
AC CHARACTERISTICS
The AC specifications are a function of the particular process used to manufacture the part, the
ratings of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the
specifications can be expressed in terms of multiple input clock periods (TCP), and actual parts will
usually experience less than a ¡Ó20 nS variation. The numbers below represent the performance
expected from a 1.2 micron CMOS process when using 2 and 4 mA output buffers.
Clock Input Waveform
XTAL1
TCH
TCL
FOP, TCP
PARAMETER
Operating Speed
Clock Period
Clock High
Clock Low
SYMBOL
FOP
TCP
TCH
TCL
MIN.
0
25
10
10
Notes:
1. The clock may be stopped indefinitely in either state.
2. The TCP specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
TYP.
-
-
-
-
MAX.
40
-
-
-
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
3
Publication Release Date: October 1997
- 7 - Revision A3

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W78C31B

8-Bit Microcontroller

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