MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 331

• Manufacturer Part Number: MC68HC908AB32
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC908AB32
MOTOROLA
NOTE:
—
Rev. 1.0
Avoid glitches on port F pins by writing to the port F data register before
changing data direction register F bits from 0 to 1.
the port F I/O logic.
When DDRFx is a logic 1, reading address $0009 reads the PTFx data
latch. When 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 17-7
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect the input.
Freescale Semiconductor, Inc.
DDRF
Bit
0
1
For More Information On This Product,
READ DDRF ($000D)
WRITE DDRF ($000D)
WRITE PTF ($0009)
READ PTF ($0009)
summarizes the operation of the port F pins.
Go to: www.freescale.com
PTF Bit
Input/Output (I/O) Ports
X
X
(1)
Table 17-7. Port F Pin Functions
Figure 17-20. Port F I/O Circuit
PTF5 to TBCH1, PTF4 to TBCH0, PTF3 to TBCH3, PTF2 to TBCH2 of TIMB
RESET
Input, Hi-Z
I/O Pin
Output
Mode
(2)
DDRFx
PTFx
Read/Write
DDRF[7:0]
DDRF[7:0]
Accesses
to DDRF
PTF1 to TACH3, PTF0 to TACH2 of TIMA
PTF[7:0]
Figure 17-20
Read
Accesses to PTF
Input/Output (I/O) Ports
Pin
PTFPUEx
Technical Data
PTF[7:0]
PTF[7:0]
V
DD
Write
shows
Port F
PTFx
331
(3)