MC908JB16DWE Datasheet, PDF (271/332 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
When bit DDRCx is a logic 1, reading address $0002 reads the PTCx
data latch. When bit 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 14-3 summarizes
the operation of the port C pins.
Table 14-3. Port C Pin Functions
DDRC
Bit
PTC Bit
I/O Pin Mode
Accesses
to DDRC
Read/Write
0
X⁽¹⁾
Input, Hi-Z^{(2) DDRC[1:0]}
1
X
Output
DDRC[1:0]
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
Accesses to PTC
Read
Pin
PTC[1:0]
Write
PTC[1:0]⁽³⁾
PTC[1:0]
MC68HC908JB16 — Rev. 1.1
Freescale Semiconductor
Input/Output (I/O) Ports
Technical Data
271