mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 111

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Figure 10-18
When bit DDRFx is a logic 1, reading address $0009 reads the PTFx data latch. When bit DDRFx is a
logic 0, reading address $0009 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
Freescale Semiconductor
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
DDRF Bit
0
1
shows the port F I/O logic.
READ DDRF ($000D)
WRITE DDRF ($000D)
WRITE PTF ($0009)
READ PTF ($0009)
PTF Bit
X
X
(1)
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
I/O Pin Mode
Input, Hi-Z
Table 10-6. Port F Pin Functions
RESET
Figure 10-18. Port F I/O Circuit
Output
(2)
Table 10-6
DDRFx
PTFx
Accesses to DDRF
Read/Write
DDRF[6:0]
DDRF[6:0]
summarizes the operation of the port F pins.
PTF[6:0]
Read
Pin
Accesses to PTF
PTF[6:0]
PTF[6:0]
PTFx
Write
(3)
Port F
111