AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 61

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

Registers
4202D–SCR–06/05
Table 36. Port Mode Register 0 - PMOD0 (91h) for AT8xC5122
Reset Value = 0000 0x00b
Table 37. Port Mode Register 0 - PMOD0 (91h) for AT83C5123
Reset Value = 00xx 0xxxb
Bit Number Bit Mnemonic Description
Bit Number Bit Mnemonic Description
P3C1
P3C1
7 - 6
7 - 6
7
5-4
1-0
7
5-4
2-0
3
2
3
CPRESRES
CPRESRES
P3C1-P3C0
P2C1-P2C0
P0C1-P0C0
P3C1-P3C0
P3C0
P3C0
6
6
-
-
P2C1
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
Port 2 Configuration bits
00 Quasi bi-directional
01 Push-pull
10 Output Low Speed
11 Input with weak pull-down
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.
Port 0 Configuration bits
00 C51 Standard P0
01 Reserved
10 Output Low Speed
11 Push-pull
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
Reserved
The value read from these bits are indeterminate. Do not set these bit.
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 these bits are indeterminate. Do not set these bit.
5
5
-
P2C0
4
4
-
CPRESRES
CPRESRES
3
3
2
2
-
-
P0C1
1
1
-
P0C0
0
0
-
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