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C-15
REGISTERS
EP_MODE
EP_MODE
Address:
Reset State:
1FE1H
FFH
Each bit of the extended port mode (EP_MODE) register controls whether the corresponding pin
functions as a standard I/O port pin or as an extended-address signal. Setting a bit configures a pin as
an extended-address signal; clearing a bit configures a pin as a standard I/O port pin.
7 0
— — — — PIN3 PIN2 PIN1 PIN0
Bit
Number
Bit
Mnemonic
Function
7:4 — Reserved; always write as zeros.
3:0 PIN3:0 Extended Address Port Pin
x
Mode
This bit determines the mode of EPORT.
x
:
0 = standard I/O port pin
1 = extended-address signal