ST6200C datasheet(40/100 Pages) STMICROELECTRONICS

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I/O PORTS (Cont’d)

7.5 REGISTER DESCRIPTION

DATA REGISTER (DR)

Port x Data Register

DRx with x = A or B.

Address DRA: 0C0h - Read /Write

Address DRB: 0C1h - Read /Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = D[7:0]

Data register bits.

Reading the DR register returns either the DR reg-

ister latch content (pin configured as output) or the

digital value applied to the I/O pin (pin configured

as input).

Caution: In input mode, modifying this register will

modify the I/O port configuration (see Table 8).

Do not use the Single bit instructions on I/O port

data registers. See (Section 7.2.5).

DATA DIRECTION REGISTER (DDR)

Port x Data Direction Register

DDRx with x = A or B.

Address DDRA: 0C4h - Read /Write

Address DDRB: 0C5h - Read /Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = DD[7:0]

Data direction register 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)

Port x Option Register

ORx with x = A or B.

Address ORA: 0CCh - Read/Write

Address ORB: 0CDh - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:0 = O[7:0]

Option register bits.

The OR register allows to distinguish in output

mode if the push-pull or open drain configuration is

selected.

Output mode:

0: Open drain output(with P-Buffer deactivated)

1: Push-pull Output

Input mode: See Table 8.

Each bit is set and cleared by software.

Caution: Modifying this register, will also modify

the I/O port configuration in input mode. (see Ta-

ble 8).

Table 10. I/O Port Register Map and Reset Values

DD7

DD6

DD5

DD4

DD3

DD2

DD1

DD0

Address

(Hex.)

Label

7654

3210

Reset Value

of all I/O port registers

0000

0C0h

DRA

MSB

LSB

0C1h

DRB

0C4h

DDRA

MSB

LSB

0C5h

DDRB

0CCh

ORA

MSB

LSB

0CDh

ORB

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