SyncMOS Technologies International, Inc.

SM89516

8-Bits Micro-controller

With 64KB flash & 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

Ver 2.1 SM89516 08/2006

8

2. Port 4 for PLCC or QFP package :

The bit addressable port 4 is available with PLCC or QFP package. The port 4 has only 4 pins and its port address is

located at 0D8H. The function of port 4 is the same as the function of port 1, port 2 and port 3.

Port4 (P4, $D8)

bit-7

bit-0

Unused

Unused

Unused

Unused

P4.3

P4.2

P4.1

P4.0

Read / Write:

-

-

-

-

R/W

R/W

R/W

R/W

Reset value:

*

*

*

*

1

1

1

1

The bit 3, bit 2, bit 1, bit 0 output the setting to pin P4.3, P4.2, P4.1, P4.0 respectively.

The port 4 output buffers can sink 20mA and can drive LED display directly.