SM89516B datasheet(24/49 Pages) SYNCMOS

24 / 49 page

SM89516B

8-Bit Micro-controller

64KB Flash

& 1KB RAM embedded

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

ISSFD-M087

Ver D SM89516B 08/07/2015

- 24 -

GPIO

Port 0 ~ Port 4 are the general purpose IO of this controller. Most of the ports are multiplexed with the other

outputs, e.g., Port 3[0] is also used as RXD in the UART application. Port0 is open-drain in the input and output

high condition, so external pull-up resistors are required. As for the other ports, the pull-up resistors are built

internally.

For general purpose applications, every pin can be assigned to either high or low independently because their

SFRs are bit addressable as given below：

Mnemonic: P0

Address: 80h

Reset

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0

FFh

P0.7~ 0: Port0 [7] ~ Port0[0]

Mnemonic: P1

Address: 90h

Reset

P1.7

P1.6

P1.5

P1.4

P1.3

P1.2

P1.1

P1.0

FFh

P1.7~ 0: Port1 [7] ~ Port1 [0]

Mnemonic: P2

Address: A0h

Reset

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2

P2.1

P2.0

FFh

P2.7~ 0: Port2 [7] ~ Port2 [0]

Mnemonic: P3

Address: B0h

Reset

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

FFh

P3.7~ 0: Port3 [7] ~ Port3 [0]

Mnemonic: P4

Address: D8h

Reset

P4.3

P4.2

P4.1

P4.0

xFh

P4.3~ 0: Port4 [3] ~ Port4 [0]

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