MC68HC08AZ32A Datasheet, PDF (311/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
I/O Ports
Port E
When bit DDREx is a logic one, reading address $0008 reads the PTEx
data latch. When bit DDREx is a logic zero, reading address $0008
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit. Table 19-6 summarizes
the operation of the port E pins.
Table 19-6. Port E Pin Functions
DDRE Bit
PTE Bit
I/O Pin Mode
Accesses to
DDRE
Read/Write
0
X⁽¹⁾
Input, Hi-Z^{(2) DDRE[7:0]}
1
X
Output
DDRE[7:0]
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
Accesses to PTE
Read
Pin
PTE[7:0]
Write
PTE[7:0]⁽³⁾
PTE[7:0]
MC68HC08AZ32A — Rev 1.0
MOTOROLA
I/O Ports
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Technical Data
311