mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 335

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908MR24 — Rev. 4.1
Freescale Semiconductor
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. Table 15-6 summarizes
the operation of the port F pins.
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
DDRF
Bit
0
1
READ DDRF ($000D)
WRITE DDRF ($000D)
WRITE PTF ($0009)
READ PTF ($0009)
PTF
X
Bit
X
(1)
Input/Output (I/O) Ports
I/O Pin Mode
Input, Hi-Z
Table 15-6. Port F Pin Functions
Figure 15-18. Port F I/O Circuit
RESET
Output
(2)
DDRFx
PTFx
Read/Write
DDRF[6:0]
DDRF[6:0]
Accesses
to DDRF
PTF[6:0]
Read
Pin
Accesses to PTF
Input/Output (I/O) Ports
Advance Information
PTF[6:0]
PTF[6:0]
Write
PTFx
(3)
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