MC908AZ60ACFUER Datasheet, PDF (260/414 Pages) Freescale Semiconductor, Inc – To provide the most up-to-date information, the revision of our documents on the World Wide Web will be the most current. Your printed copy may be an earlier revision. To verify you have the latest information available, refer to:

Input/Output Ports
Figure 22-16 shows the port E I/O logic.
READ DDRE ($000C)
WRITE DDRE ($000C)
RESET
WRITE PTE ($0008)
DDREx
PTEx
PTEx
READ PTE ($0008)
Figure 22-16. Port E I/O Circuit
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. Table 22-5 summarizes the operation of the port E pins.
Table 22-5. Port E Pin Functions
DDRE
PTE
Bit
Bit
I/O Pin
Mode
Accesses to DDRE
Read/Write
0
X
Input, Hi-Z
DDRE[7:0]
1
X
Output
DDRE[7:0]
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
Accesses to PTE
Read
Write
Pin
PTE[7:0]⁽¹⁾
PTE[7:0]
PTE[7:0]
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.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
260
Freescale Semiconductor