Registers – Rainbow Electronics AT89C5122 User Manual
Page 61
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
7
6
5
4
3
2
1
0
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
2
-
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
7
6
5
4
3
2
1
0
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.