MC68HC08AZ16 Datasheet, PDF (334/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

I/O Ports
Port D
READ DDRD ($0007)
WRITE DDRD ($0007)
RESET
WRITE PTD ($0003)
READ PTD ($0003)
DDRDx
PTDx
PTDx
Figure 12. Port D I/O circuit
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit. Table 5 summarizes the
operation of the port D pins.
Table 5. Port D pin functions
DDRD Bit
0
PTD Bit
X⁽¹⁾
I/O Pin Mode
Input, Hi-Z⁽²⁾
Accesses to
DDRD
Read/Write
DDRD[7:0]
1
X
Output
DDRD[7:0]
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
Accesses to PTD
Read
Pin
PTD[7:0]
Write
PTD[7:0]⁽³⁾
PTD[7:0]
13-io
MOTOROLA
I/O Ports
MC68HC08AZ32
333