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C-31
REGISTERS
Px_MODE
P
x
_MODE
x
= 1–4
Address:
Reset State:
Table C-11
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
= 1–3 PIN7 PIN6 PIN5 PIN4 PIN3 PIN2 PIN1 PIN0
7 0
x
= 4 ————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-12 lists the special-function signals for each pin.
Table C-11. P
x
_MODE Addresses and Reset Values
Register Address Reset Value
P1_MODE 1FD0H 00H
P2_MODE 1FD1H 80H
P3_MODE 1FD8H 01H
P4_MODE 1FD9H 00H
Table C-12. Special-function Signals for Ports 1–4
Port 1 Port 2 Port 3 Port 4
Pin
Special-
function
Signal
Pin
Special-
function
Signal
Pin
Special-
function
Signal
Pin
Special-
function
Signal
P1.0 EPA0 P2.0 TXD P3.0 CS0# P4.0 PWM0
P1.1 EPA1 P2.1 RXD P3.1 CS1# P4.1 PWM1
P1.2 EPA2 P2.2 EXTINT0 P3.2 CS2# P4.2 PWM2
P1.3 EPA3 P2.3 BREQ# P3.3 CS3# P4.3 —
P1.4 T1CLK P2.4 EXTINT1 P3.4 CS4#
P1.5 T1DIR P2.5 HOLD# P3.5 CS5#
P1.6 T2CLK P2.6 HLDA# P3.6 EXTINT2
P1.7 T2DIR P2.7 CLKOUT P3.7 EXTINT3