Intel 8XC196NT User Manual page 537

8XC196NT USER'S MANUAL
P34_DRV
P34_DRV
The port 3/4 complementary enable (P34_DRV) register controls whether the port is configured as
complementary or open-drain outputs. In complementary operation, Ports 3 and 4 are driven high
when a one is written to the P x _REG ( x = 3–4) register. This mode does not require ports 3 and 4 to
be externally pulled high by pull-up resistors.
7
P3DRV P4DRV
Bit Bit
Number Mnemonic
7 P3DRV
6 P4DRV
5:0 —
C-42
— —
Port 3 I/O Mode
This bit controls whether port 3 is configured as complementary or open-
drain outputs.
0 = selects open-drain operation
1 = selects complementary operation
Port 4 I/O Mode
This bit controls whether port 4 is configured as complementary or open-
drain outputs.
0 = selects open-drain operation
1 = selects complementary operation
Reserved; always write as zeros.
Address:
Reset State:
— —
Function
1FF4H
00H
0
— —