AT89C5122DS-RDRUM datasheet(59/208 Pages) ATMEL

59 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Registers

Reset Value = 0000 0x00b

Reset Value = 00xx 0xxxb

Table 36.

Port Mode Register 0 - PMOD0 (91h) for AT8xC5122

654

P3C1

P3C0

P2C1

P2C0

CPRESRES

P0C1

P0C0

Bit Number

Bit Mnemonic Description

7 - 6

P3C1-P3C0

Port 3 Configuration bits (Applicable to P3.0, P3.1, P3.3, P3.4 only)

Quasi bi-directional

Push-pull

Output Low Speed

Input with weak pull-up

5-4

P2C1-P2C0

Port 2 Configuration bits

Quasi bi-directional

Push-pull

Output Low Speed

Input with weak pull-down

3CPRESRES

Card Presence Pull-up resistor

Cleared to connect the internal 100K pull-up

Set to disconnect the internal pull-up

Reserved

The value read from this bit is indeterminate. Do not set this bit.

1-0

P0C1-P0C0

Port 0 Configuration bits

C51 Standard P0

Reserved

Output Low Speed

Push-pull

Table 37.

Port Mode Register 0 - PMOD0 (91h) for AT83C5123

654

P3C1

P3C0

CPRESRES

Bit Number

Bit Mnemonic Description

7 - 6

P3C1-P3C0

Port 3 Configuration bits (Applicable to P3.0, P3.1, P3.3, P3.4 only)

Quasi bi-directional

Push-pull

Output Low Speed

Input with weak pull-up

5-4

Reserved

The value read from these bits are indeterminate. Do not set these bit.

3CPRESRES

Card Presence Pull-up resistor

Cleared to connect the internal 100K pull-up

Set to disconnect the internal pull-up

2-0

Reserved

The value read from these bits are indeterminate. Do not set these bit.

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