mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 204

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports
Technical Data
202
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.
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)
Input/Output (I/O) Ports
PTE
Bit
X
X
Table 16-5. Port E Pin Functions
Figure 16-16. Port E I/O Circuit
RESET
Input, Hi-Z
I/O Pin
Output
Mode
DDREx
PTEx
Read/Write
DDRE[7:0]
DDRE[7:0]
Accesses
to DDRE
Table 16-5
PTE[7:0]
Freescale Semiconductor
Read
Accesses to PTE
Pin
MC68HC08QA24
summarizes
PTE[7:0]
PTE[7:0]
Write
PTEx
(1)