MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 204

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Input/Output (I/O) Ports
Advance Information
204
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 15-5. Port E Pin Functions
Figure 15-16. 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
MC68HC708AS48
Table 15-5
PTE[7:0]
Read
Accesses to PTE
Pin
summarizes
MOTOROLA
PTE[7:0]
PTE[7:0]
—
Write
Rev. 4.0
PTEx
(1)