Port D
Table 16-5 summarizes the operation of the port D pins.
Table 16-5. Port D Pin Functions
Accesses to DDRD
Read/Write
Accesses to PTD
DDRD
Bit
PTD Bit
I/O Pin Mode
Read
Pin
Write
X(1)
X
Input, Hi-Z(2)
Output
PTD[7:0](3)
PTD[7:0]
0
1
DDRD[7:0]
DDRD[7:0]
PTD[7:0]
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
269