mc68hc908gp20 Freescale Semiconductor, Inc, mc68hc908gp20 Datasheet - Page 243

• Manufacturer Part Number: mc68hc908gp20
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908GP20
Freescale Semiconductor
DDRE Bit
Notes:
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
0
1
PTE Bit
—
X
X
(1)
Rev 2.1
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.
I/O Pin Mode
Input, Hi-Z
Output
Table 16-6. Port E Pin Functions
READ DDRE ($000C)
WRITE DDRE ($000C)
WRITE PTE ($0008)
READ PTE ($0008)
(2)
Accesses to DDRE
Figure 16-19. Port E I/O Circuit
DDRE1–DDRE0]
RESET
DDRE1–DDRE0
Read/Write
DDREx
PTEx
PTE1–PTE0
Read
Pin
Table 16-6
Accesses to PTE
Advance Information
PTE1–PTE0
PTE1–PTE0
summarizes
Write
PTEx
(3)
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