Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 61)

AT8xC5122/23

4202E–SCR–06/06

Registers

Reset Value = 0000 0x00b

Reset Value = 00xx 0xxxb

Table 36. Port Mode Register 0 - PMOD0 (91h) for AT8xC5122

7654 3 210

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)

00 Quasi bi-directional

01 Push-pull

10 Output Low Speed

11 Input with weak pull-up

5-4 P2C1-P2C0

Port 2 Configuration bits

00 Quasi bi-directional

01 Push-pull

10 Output Low Speed

11 Input with weak pull-down

3 CPRESRES

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

00 C51 Standard P0

01 Reserved

10 Output Low Speed

11 Push-pull

Table 37. Port Mode Register 0 - PMOD0 (91h) for AT83C5123

7654 3 210

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)

00 Quasi bi-directional

01 Push-pull

10 Output Low Speed

11 Input with weak pull-up

5-4

Reserved

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

3 CPRESRES

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.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 212 213

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