s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 331

• Manufacturer Part Number: s908ab32ag0cfue
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

MC68HC908AB32
Freescale Semiconductor
NOTE:
—
Rev. 1.1
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.
DDRF
Bit
0
1
READ DDRF ($000D)
WRITE DDRF ($000D)
WRITE PTF ($0009)
READ PTF ($0009)
summarizes the operation of the port F pins.
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
PTFx
331
(3)