mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 205

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

16.8 Port F
16.8.1 Port F Data Register
MC68HC08QA24
Freescale Semiconductor
Function:
Address:
Alternate
Port F is a 4-bit special function port that shares four of its pins with the
timer interface module (TIM).
The port F data register contains a data latch for each of the four port F
pins.
PTF[3:0] — Port F Data Bits
TACLK — Timer A Clock Input Bit
TBCLK — Timer B Clock Input Bit
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each port F pin is under the control of the corresponding bit in data
direction register F. Reset has no effect on PTF[3:0].
The PTF3/TACLK pin is the external clock input for TIMA. The
prescaler select bits, PS[2:0], select PTF3/TACLK as the TIMA clock
input. (See
selected as the TIMA clock, PTF3/TACLK is available for
general-purpose I/O.
The PTF2/TBCLK pin is the external clock input for TIMB. The
prescaler select bits, PS[2:0], select FLT as the TIMB clock input.
(See
as the TIMB clock, PTF2/TBCLK is available for general-purpose I/O.
$0009
21.9.1 TIMB Status and Control
Bit 7
R
R
0
Figure 16-17. Port F Data Register (PTF)
Input/Output (I/O) Ports
20.9.1 TIMA Status and Control
= Reserved
R
6
0
R
5
0
Unaffected by reset
R
4
0
TACLK
PTF3
Register.) When not selected
3
Register.) When not
TBCLK
PTF2
2
Input/Output (I/O) Ports
TBCH1
PTF1
Technical Data
1
TBCH2
PTF0
Bit 0
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