W77C32-25 查看數據表（PDF） - Winbond

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W77C32-25

8 BIT MICROCONTROLLER

Winbond 

Preliminary W77C32

PIN DESCRIPTION

SYMBOL

EA

PSEN

ALE

RST

XTAL1

XTAL2

VSS

VDD

P0.0−P0.7

P1.0−P1.7

P2.0−P2.7

P3.0−P3.7

TYPE

DESCRIPTIONS

I EXTERNAL ACCESS ENABLE: It should be kept low.

O PROGRAM STORE ENABLE: PSEN enables the external ROM data onto the

Port 0 address/data bus during fetch and MOVC operations.

O ADDRESS LATCH ENABLE: ALE is used to enable the address latch that

separates the address from the data on Port 0.

I RESET: A high on this pin for two machine cycles while the oscillator is running

resets the device.

I CRYSTAL1: This is the crystal oscillator input. This pin may be driven by an

external clock.

O CRYSTAL2: This is the crystal oscillator output. It is the inversion of XTAL1.

I GROUND: Ground potential

I POWER SUPPLY: Supply voltage for operation.

I/O PORT 0: Port 0 is an open-drain bi-directional I/O port. This port also provides a

multiplexed low order address/data bus during accesses to external memory.

I/O PORT 1: Port 1 is a bi-directional I/O port with internal pull-ups. The bits have

alternate functions which are described below:

T2(P1.0): Timer/Counter 2 external count input

T2EX(P1.1): Timer/Counter 2 Reload/Capture/Direction control

RXD1(P1.2): Serial port 1 RXD

TXD1(P1.3): Serial port 1 TXD

INT2(P1.4): External Interrupt 2

INT3 (P1.5): External Interrupt 3

INT4(P1.6): External Interrupt 4

INT5 (P1.7): External Interrupt 5

I/O PORT 2: Port 2 is a bi-directional I/O port with internal pull-ups. This port also

provides the upper address bits for accesses to external memory.

I/O PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have

alternate functions, which are described below:

RXD(P3.0) : Serial Port 0 input

TXD(P3.1) : Serial Port 0 output

INT0 (P3.2) : External Interrupt 0

INT1(P3.3) : External Interrupt 1

T0(P3.4) : Timer 0 External Input

T1(P3.5) : Timer 1 External Input

WR (P3.6) : External Data Memory Write Strobe

RD (P3.7) : External Data Memory Read Strobe

P4.0−P4.3

I/O PORT 4: Port 4 is a 4-bit bi-directional I/O port. The P4.0 also provides the

alternate function WAIT which is the wait state control signal.

* Note: TYPE I: input, O: output, I/O: bi-directional.

Publication Release Date: March 1999

-3-

Revision A1

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