Port E I/O Circuit - Motorola MC68HC908GP32 Technical Data Manual

DDRE Bit PTE Bit
(1)
0
X
1 X
Notes:
1. X = Don't care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
MC68HC908GP32 MC68HC08GP32
•
MOTOROLA
Freescale Semiconductor, Inc.
READ DDRE ($000C)
WRITE DDRE ($000C)
RESET
WRITE PTE ($0008)
READ PTE ($0008)
Figure 16-19. Port E I/O Circuit
When bit DDREx is a logic 1, reading address $0008 reads the PTEx
data latch. When bit DDREx is a logic 0, 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.
the operation of the port E pins.
Table 16-6. Port E Pin Functions
Accesses to DDRE
I/O Pin Mode
(2)
DDRE1–DDRE0
Input, Hi-Z
Output DDRE1–DDRE0
Rev. 6
—
Input/Output (I/O) Ports
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DDREx
PTEx
Read/Write
PTE1–PTE0
Input/Output (I/O) Ports
Table 16-6 summarizes
Accesses to PTE
Read Write
Pin
PTE1–PTE0
PTE1–PTE0
Technical Data
Port E
PTEx
(3)
233