ST7SCR datasheet(34/102 Pages) STMICROELECTRONICS

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ST7SCR

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I/O PORTS (Cont’d)

9.4 Register Description

DATA REGISTERS (PxDR)

Port A Data Register (PADR): 0011h

Port B Data Register (PBDR): 0015h

Port C Data Register (PCDR): 0018h

Port D Data Register (PCDR): 0019h

Read /Write

Reset Value Port A: 0000 0000 (00h)

Reset Value Port B: 0000 0000 (00h)

Reset Value Port C: 0000 0000 (00h)

Reset Value Port D: 0000 0000 (00h)

Bits 7:0 = D[7:0]

Data Register 8 bits.

The DR register has a specific behaviour accord-

ing to the selected input/output configuration. Writ-

ing the DR register is always taken in account

even if the pin is configured as an input. Reading

the DR register returns either the DR register latch

content (pin configured as output) or the digital val-

ue applied to the I/O pin (pin configured as input).

DATA DIRECTION REGISTER (PADDR)

Port A Data Direction Register (PADDR): 0012h

Read/Write

Reset Value Port A: 0000 0000 (00h)

Bits 7:0 = DD7-DD0

Data Direction Register 8 bits.

The DDR register gives the input/output direction

configuration of the pins. Each bits is set and

cleared by software.

0: Input mode

1: Output mode

OPTION REGISTER (PxOR)

Port x Option Register

PxOR with x = A, B, or D

Port A Option Register (PAOR): 0013h

Port B Option Register (PBOR): 0016h

Port D Option Register (PDOR): 001Ah

Read /Write

Reset Value: 0000 0000 (00h)

Bits 7:0 = OM[7:0]

Option register 8 bits.

The OR register allows to distinguish in output

mode if the push-pull or open drain configuration is

selected.

Each bit is set and cleared by software.

0: Output open drain

1: Output push-pull

PULL UP CONTROL REGISTER (PxPUCR)

Port x Pull Up Register

PxPUCR with x = A, B, or D

Port A Pull up Register (PAPUCR): 0014h

Port B Pull up Register (PBPUCR): 0017h

Port D Pull up Register (PDPUCR): 001Bh

Read /Write

Reset Value: 0000 0000 (00h)

Bits 7:0 = PU[7:0]

Pull up register 8 bits.

The PU register is used to control the pull up.

Each bit is set and cleared by software.

0: Pull up inactive

1: Pull up active

DD7

DD6

DD5

DD4

DD3

DD2

DD1

DD0

OM7

OM6

OM5

OM4

OM3

OM2

OM1

OM0

PU7

PU6

PU5

PU4

PU3

PU2

PU1

PU0

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