s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 254

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

I/O Ports
Figure 23-16
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.
254
shows the port E I/O logic.
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
DDRE
Bit
0
1
READ DDRE ($000C)
WRITE DDRE ($000C)
WRITE PTE ($0008)
READ PTE ($0008)
PTE
Bit
X
X
Table 23-5. Port E Pin Functions
RESET
MC68HC908AZ32A Data Sheet, Rev. 2
Figure 23-16. Port E I/O Circuit
Input, Hi-Z
I/O Pin
Output
Mode
Table 23-5
DDREx
PTEx
Accesses to
Read/Write
DDRE[7:0]
DDRE[7:0]
DDRE
summarizes the operation of the port E pins.
PTE[7:0]
Read
Pin
Accesses to PTE
PTE[7:0]
PTE[7:0]
Write
Freescale Semiconductor
PTEx
(1)