MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 260

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Input/Output Ports
Figure 22-16
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.
22.7 Port F
Port F is a 7-bit special function port that shares four of its pins with the timer interface module (TIMA-6)
and two of its pins with the timer interface module (TIMB) on the MC68HC908AZ60A. Note that PTF4,
PTF5 and PTF6 are only available on 64-pin package options.
260
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
shows the port E I/O logic.
DDRE
Bit
0
1
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
READ DDRE ($000C)
WRITE DDRE ($000C)
WRITE PTE ($0008)
READ PTE ($0008)
PTE
Bit
X
X
Table 22-5. Port E Pin Functions
RESET
Figure 22-16. Port E I/O Circuit
Input, Hi-Z
I/O Pin
Output
Mode
Table 22-5
Accesses to DDRE
DDREx
PTEx
Read/Write
DDRE[7:0]
DDRE[7:0]
summarizes the operation of the port E pins.
PTE[7:0]
Read
Pin
Accesses to PTE
PTE[7:0]
Freescale Semiconductor
PTE[7:0]
Write
PTEx
(1)