W78L516A 查看數據表（PDF） - Winbond

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W78L516A

8-BIT MICROCONTROLLER

Winbond 

W78LE516/W78L516A

4. PIN DESCRIPTION

SYMBOL

EA

TYPE

DESCRIPTIONS

EXTERNAL ACCESS ENABLE: This pin forces the processor to execute the

I external ROM. The ROM address and data will not be presented on the bus if

the EA pin is high.

PSEN

ALE

RST

XTAL1

XTAL2

VSS

VDD

P0.0−P0.7

P1.0−P1.7

P2.0−P2.7

P3.0−P3.7

P4.0−P4.3

PROGRAM STORE ENABLE: PSEN enables the external ROM data in the

O H Port 0 address/data bus. When internal ROM access is performed, no PSEN

strobe signal outputs originate from this pin.

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

O H separates the address from the data on Port 0. ALE runs at 1/6th of the

oscillator frequency.

IL

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

running resets the device.

I

CRYSTAL 1: This is the crystal oscillator input. This pin may be driven by an

external clock.

O CRYSTAL 2: 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 D PORT 0: Function is the same as that of standard 8052.

I/O H PORT 1: Function is the same as that of standard 8052.

I/O H

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 H PORT 3: Function is the same as that of the standard 8052.

I/O H PORT 4: A bi-directional I/O. See details below.

* Note: TYPE I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain

PORT4

Another bit-addressable port P4 is also available and only 4 bits (P4<3:0>) can be used. This port

address is located at 0D8H with the same function as that of port P1,

Example:

P4

REG 0D8H

MOV P4, #0AH

; Output data "A" through P4.0−P4.3.

MOV A, P4

; Read P4 status to Accumulator.

ORL P4, #00000001B ; Set bit P4.0

ANL P4, #11111101B ; Clear bit P4.1

-6-

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