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C-31
REGISTERS
Px_MODE
P
x
_MODE
x
= 2, 5 (8XC196MC)
x
= 2, 5, 7 (8XC196MD)
x
= 1, 2, 5 (8XC196MH)
Address:
Reset State:
Table C-7
Each bit of the port
x
mode (P
x
_MODE) register controls whether the corresponding pin functions as a
standard I/O port pin or as a special-function signal.
7 0
x
= 1 (MH) ————PIN3 PIN2 PIN1 PIN0
7 0
x
= 2, 5 (M
x
) PIN7 PIN6 PIN5 PIN4 PIN3 PIN2 PIN1 PIN0
7 0
x
= 7 (MD) PIN7 PIN6 PIN5 PIN4 PIN3 PIN2 PIN1 PIN0
Bit
Number
Bit
Mnemonic
Function
7:0
†
PIN7:0 Port
x
Pin
y
Mode
This bit determines the mode of the corresponding port pin:
0 = standard I/O port pin
1 = special-function signal
Table C-8 lists the special-function signals for each pin.
†
The bits shown as dashes (—) are reserved; for compatibility with future devices, write zeros to these
bits.
Table C-7. P
x
_MODE Addresses and Reset Values
Register Address Reset Value
P1_MODE (8XC196MH) 1F99H 00H
P2_MODE (8XC196M
x
) 1FD0H 00H
P5_MODE (8XC196MC, MD)
P5_MODE (8XC196MH)
1FF1H
1FF1H
FFH when pin is not driven
80H if the EA# pin is high, A9H if EA# is low
P7_MODE (8XC196MD) 1FD1H 00H