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8XC196NP, 80C196NU USER’S MANUAL
C-14
EP_DIR
EP_DIR
Address:
Reset State:
1FE3H
FFH
In I/O mode, each bit of the extended port I/O direction (EP_DIR) register controls the direction of the
corresponding pin. Clearing a bit configures a pin as a complementary output; setting a bit configures
a pin as either an input or an open-drain output. (Open-drain outputs require external pull-ups).
Any pin that is configured for its extended-address function is forced to the complementary output
mode except during reset, hold, idle, powerdown, and standby. (Standby mode is available only on the
80C196NU.)
7 0
— — — — PIN3 PIN2 PIN1 PIN0
Bit
Number
Bit
Mnemonic
Function
7:4 — Reserved; always write as ones.
3:0 PIN3:0 Extended Address Port Pin
x
Direction
This bit configures EPORT.
x
as a complementary output or an
input/open-drain output.
0 = complementary output
1 = input or an open-drain output