Datasheet

Input/Output (I/O) Ports
MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor Input/Output (I/O) Ports 353
When DDRCx is a logic 1, reading address $0002 reads the PTCx data
latch. When DDRCx is a logic 0, reading address $0002 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 17-4 summarizes the operation of the port C pins.
Table 17-4. Port C Pin Functions
DDRC
Bit
PTC Bit I/O Pin Mode
Accesses to DDRC Accesses to PTC
Read/Write Read Write
0X
(1)
Notes:
1. X = don’t care; except PTC2.
Input, Hi-Z
(2)
2. Hi-Z = high impedance.
DDRC[7:0] Pin PTC[7:0]
(3)
3. Writing affects data register, but does not affect input.
1 X Output DDRC[7:0] PTC[7:0] PTC[7:0]