ST72371 datasheet(28/94 Pages) STMICROELECTRONICS

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ST72371/ST72372

I/O PORTS (Cont’d)

4.1.3 Register Description

DATA REGISTERS (DR)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = D7-D0 Data Register 8 bits.

The behaviour of the DR register depends on the

selected input/output configuration. Writing the DR

is configured as an input. Reading the DR register

returns either the DR register latch content (pin

configured as output) or the digital value applied to

the I/O pin (pin configured as input).

DATA DIRECTION REGISTERS (DDR)

Read/Write

Reset Value: 0000 0000 (00h) (input mode)

Bit 7:0 = DD7-DD0

Data Direction Register 8 bits.

The DDR register gives the input/output direction

configuration of the pins. Each bit is set and

cleared by software.

0: Input mode

1: Output mode

OPTION REGISTER (OR)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = AD[7:0] Port B Digital/Analog Input Con-

figuration Bits.

0: The pull-up is connected and pin configured as

digital input (reset condition)

1: The pull-up is disconnected and the pin is con-

figured as analog input.

DD7

DD6

DD5

DD4

DD3

DD2

DD1

DD0

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

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