UPSD3312D datasheet(81/272 Pages) STMICROELECTRONICS

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UPSD33xx

I/O ports of MCU module

Doc ID 9685 Rev 7

81/272

Table 35.

P3: I/O Port 3 register (SFR B0h, reset value FFh)

Table 36.

P3 register bit definition

Table 37.

P4: I/O Port 4 register (SFR C0h, reset value FFh)

Table 38.

P4 register bit definition

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

Bit

Symbol

R/W

Function(1)

Write '1' or '0' for pin output. Read for pin input, but prior to READ, this bit must have been set to '1' by

firmware or by a reset event.

7P3.7

R,W

Port pin 3.7

6P3.6

R,W

Port pin 3.6

5P3.5

R,W

Port pin 3.5

4P3.4

R,W

Port pin 3.4

3P3.3

R,W

Port pin 3.3

2P3.2

R,W

Port pin 3.2

1P3.1

R,W

Port pin 3.1

0P3.0

R,W

Port pin 3.0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

P4.7

P4.6

P4.5

P4.4

P4.3

P4.2

P4.1

P4.0

Bit

Symbol

R/W

Function(1)

Write '1' or '0' for pin output. Read for pin input, but prior to READ, this bit must have been set to '1' by

firmware or by a reset event.

7P4.7

R,W

Port pin 4.7

6P4.6

R,W

Port pin 4.6

5P4.5

R,W

Port pin 4.5

4P4.4

R,W

Port pin 4.4

3P4.3

R,W

Port pin 4.3

2P4.2

R,W

Port pin 4.2

1P4.1

R,W

Port pin 4.1

0P4.0

R,W

Port pin 4.0

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