SMBP2501BPB datasheet(72/107 Pages) SONIX

72 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 72

Version 2.1

7.3 I/O OPEN-DRAIN REGISTER

P1.0 is built-in open-drain function. P1.0 must be set as output mode when enable P1.0 open-drain function.

Open-drain external circuit is as following.

MCU2

VCC

Open-drain pin

MCU1

Pull -up Resi stor

The pull-up resistor is necessary. Open-drain output high is driven by pull-up resistor. Output low is sunken by MCU

’s

pin.

0E9H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P1OC

P10OC

Read/Write

After reset

Bit 0

P10OC: P1.0 open-drain control bit

0 = Disable open-drain mode

1 = Enable open-drain mode



Example: Enable P1.0 to open-drain mode and output high.

B0BSET

P1.0

; Set P1.0 buffer high.

B0BSET

P10M

; Enable P1.0 output mode.

MOV

A, #01H

; Enable P1.0 open-drain function.

B0MOV

P1OC, A



Note: P1OC is write only register. Setting P10OC must be used

“MOV” instructions.



Example: Disable P1.0 to open-drain mode and output low.

MOV

A, #0

; Disable P1.0 open-drain function.

B0MOV

P1OC, A



Note: After disable P1.0 open-drain function, P1.0 mode returns to last I/O mode.

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