STC12C5616AD datasheet(72/377 Pages) STC

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P1M0 7

P1M1 [7 0

I/O ports Mode

quasi_bidirectional(standard 8051 I/O port output

Sink Current up to 20mA , pull-up Current is 230μA ,

Because of manufactured error, the actual pull-up current is 250uA ~ 150uA

push-pull output(strong pull-up output current can be up to 20mA, resistors

need to be added to restrict current

input-only (high-impedance )

Open Drain internal

pull-up resistors should be disabled and external

pull-up resistors need to join.

Example: MOV P1M0, #10100000B

MOV

P1M1, #11000000B

;P1.7 in Open Drain mode, P1.6 in strong push-pull output, P1.5 in high-impedance input, P1.4/P1.3/P1.2/

P1.1/P1.0 in quasi_bidirectional/weak pull-up

/weak pull-up

P1 Configure <P1.7, P1.6, P1.5, P1.4, P1.3, P1.2, P1.1, P1.0 port> (P1 address

address 90H))

P0M0 7

P0M1 [7 0

I/O ports Mode

quasi_bidirectional (standard 8051 I/O port output

Sink Current up to 20mA , pull-up Current is 230μA ,

Because of manufactured error, the actual pull-up current is 250uA ~ 150uA

push-pull output(strong pull-up output current can be up to 20mA, resistors

need to be added to restrict current

input-only (high-impedance )

Open Drain internal

pull-up resistors should be disabled and external

pull-up resistors need to join.

Example: MOV P0M0, #00001010B

MOV

P0M1, #00001100B

;P0.3 in Open Drain mode, P0.2 in strong push-pull output, P0.1 in high-impedance input, P0.0 in

quasi_bidirectional/weak pull-up

/weak pull-up

P0 Configure <P0.7, P0.6, P0.5, P0.4, P0.3, P0.2, P0.1, P0.0 port> (P0 address

address 80H))

Some SFRs related with I/O ports are listed below.

P3 register (bit addressable

SFR name Address

bit

B0H

name

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

P3 register could be bit-addressable and set/cleared by CPU. And P3.7~P3.0 coulde be set/cleared by CPU.

P3M0 register (non bit addressable

SFR name Address

bit

P3M0

B1H

name P3M0.7 P3M0.6 P3M0.5 P3M0.4 P3M0.3 P3M0.2 P3M0.1 P3M0.0

P3M1 register (non bit addressable

SFR name Address

bit

P3M1

B2H

name P3M1.7 P3M1.6 P3M1.5 P3M1.4 P3M1.3 P3M1.2 P3M1.1 P3M1.0

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