mc68hc908jw32 Freescale Semiconductor, Inc, mc68hc908jw32 Datasheet - Page 179

• Manufacturer Part Number: mc68hc908jw32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Figure 13-16
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.
Freescale Semiconductor
shows the port E I/O circuit logic.
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
DDRE
Bit
0
1
READ DDRE ($0009)
WRITE DDRE ($0009)
WRITE PTE ($0008)
READ PTE ($0008)
PTE
X
Bit
X
(1)
Table 13-9. Port E Pin Functions
RESET
Figure 13-16. Port E I/O Circuit
MC68HC908JW32 Data Sheet, Rev. 5
I/O Pin Mode
Input, Hi-Z
Output
Table 13-9
(2)
DDREx
PTEx
Read/Write
DDRE[7:2]
DDRE[7:2]
Accesses
to DDRE
summarizes the operation of the port E pins.
PTE[7:2]
Read
Pin
Accesses to PTE
PTE[7:2]
PTE[7:2]
Write
PTEx
(3)
Port E
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