UPSD3312D datasheet(83/272 Pages) STMICROELECTRONICS

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UPSD33xx

I/O ports of MCU module

Doc ID 9685 Rev 7

83/272

Table 39.

P3SFS: Port 3 Special Function Select register (SFR 91h, reset value 00h)

Table 40.

P3SFS register bit definition

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P3SFS7

P3SFS6

P3SFS5

P3SFS4

P3SFS3

P3SFS2

P3SFS1

P3SFS0

Port 3 pin

R/W

Default port function

Alternate port function

P3SFS[i] - 0; Port 3 pin, i = 0..7

P3SFS[i] - 1; Port 3 pin, i = 0..7

R,W

GPIO

UART0 Receive, RXD0

R,W

GPIO

UART0 Transmit, TXD0

R,W

GPIO

Ext Intr 0/Timer 0 Gate,

EXT0INT/TG0

R,W

GPIO

Ext Intr 1/Timer 1 Gate,

EXT1INT/TG1

R,W

GPIO

Counter 0 Input, C0

R,W

GPIO

Counter 0 Input, C1

R,W

GPIO

I2C Data, I2CSDA

R,W

GPIO

I2C Clock, I2CCL

Table 41.

P1SFS0: Port 1 Special Function Select 0 register (SFR 8Eh, reset value

00h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P1SF07

P1SF06

P1SF05

P1SF04

P1SF03

P1SF02

P1SF01

P1SF00

Table 42.

P1SFS1: Port 1 Special Function Select 1 register (SFR 8Fh, reset value

00h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P1SF17

P1SF16

P1SF15

P1SF14

P1SF13

P1SF12

P1SF11

P1SF10

Table 43.

P1SFS0 and P1SFS1 details

Port 1 pin

R/W

Default port function

Alternate 1 port

function

P1SFS0[i] = 0, P1SFS1[i] = x

P1SFS0[i] = 1,

P1SFS1[i] = 0

Port 1 Pin, i = 0.. 7

R,W

GPIO

Timer 2 Count Input, T2

ADC Chn 0 Input, ADC0

R,W

GPIO

Timer 2 Trigger Input,

TX2

ADC Chn 1 Input, ADC1

R,W

GPIO

UART1 Receive, RXD1

ADC Chn 2 Input, ADC2

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