MC68HC08AZ32A Datasheet, PDF (320/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

I/O Ports
Freescale Semiconductor, Inc.
When bit DDRHx is a logic one, reading address $000B reads the PTHx
data latch. When bit DDRHx is a logic zero, reading address $000B
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data. Table 19-9 summarises the operation
of the port H pins.
Table 19-9. Port H Pin Functions
DDRH Bit
PTH Bit
I/O Pin Mode
Accesses to
DDRH
Read/Write
0
X⁽¹⁾
Input, Hi-Z^{(2) DDRH[1:0]}
1
X
Output
DDRH[1:0]
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
Accesses to PTH
Read
Pin
PTH[1:0]
Write
PTH[1:0]⁽³⁾
PTH[1:0]
Technical Data
320
MC68HC08AZ32A — Rev 1.0
I/O Ports
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