MPC89x53AF datasheet(5/38 Pages) MEGAWIN

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P3.5 (T1)

P3.6 (/WR)

P3.7 (/RD)

keep the port high.

Port3 also serves

other special functions of this device.

P3.0 and P3.1 act as receiver and

transceiver of the data for UART function

block,

Alias RXD and TXD.

P3.2 and P3.3 also act as external

interrupt sources, alias INT0 and INT1.

P3.4 and P3.5 also act as event sources

for timer0 and timer1 individually, alias

T0 and T1.

P3.6 also acts as write signal while

access to external memory, alias /WR.

P3.7 also acts as read signal while

access to external memory, alias /RD.

P4.0

P4.1

P4.2 (/INT3)

P4.3 (/INT2)

Port4 is extended I/O ports such like

Port1. It can be available only on

44L-PLCC and 44L-PQFP package.

RESET

A high on this pin for at least two

machine cycles will reset the device.

ALE

Output pulse for latching the low byte of

address during accesses to external

memory.

/PSEN

The read strobe to external program

memory, low active.

/EA

EA must be kept at low to enable the

device to fetch program code from

external flash memory.

An internal pull-up resistance has been

embedded in this pin.

XTAL1

Input to the inverting oscillator amplifier.

XTAL2

Output from the inverting amplifier.

VDD

Power Supply

VSS

Ground

MEGAWIN

MPC89x53A Data Sheet

MPC89x53AF Datasheet(PDF) 5 Page - Megawin Technology Co., Ltd

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