MC68HC908AZ60A_13 Datasheet, PDF (261/414 Pages) Freescale Semiconductor, Inc – Microcontrollers

22.7.1 Port F Data Register
The port F data register contains a data latch for each of the seven port F pins.
Address:
Read:
Write:
Reset:
Alternative
Function:
$0009
Bit 7
0
R
R
6
5
4
3
2
PTF6
PTF5
PTF4
PTF3
PTF2
Unaffected by Reset
TBCH1 TBCH0 TACH5 TACH4
= Reserved
Figure 22-17. Port F Data Register (PTF)
1
PTF1
TACH3
Bit 0
PTF0
TACH2
Port F
PTF[6:0] — Port F Data Bits
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[6:0].
TACH[5:2] — Timer A Channel I/O Bits
The PTF3–PTF0/TACH2 pins are the TIM input capture/output compare pins. The edge/level select
bits, ELSxB:ELSxA, determine whether the PTF3–PTF0/TACH2 pins are timer channel I/O pins or
general-purpose I/O pins. (See 25.8.1 TIMA Status and Control Register).
TBCH[1:0] — Timer B Channel I/O Bits
The PTF5/TBCH1–PTF4/TBCH0 pins are the TIMB input capture/output compare pins. The edge/level
select bits, ELSxB:ELSxA, determine whether the PTF5/TBCH1–PTF4/TBCH0 pins are timer channel
I/O pins or general-purpose I/O pins. (See 20.8.1 TIMB Status and Control Register).
NOTE
Data direction register F (DDRF) does not affect the data direction of port F
pins that are being used by the TIM. However, the DDRF bits always
determine whether reading port F returns the states of the latches or the
states of the pins. (See Table 22-6).
22.7.2 Data Direction Register F
Data direction register F determines whether each port F pin is an input or an output. Writing a logic 1 to
a DDRF bit enables the output buffer for the corresponding port F pin; a logic 0 disables the output buffer.
Address:
Read:
Write:
Reset:
$000D
Bit 7
6
5
4
3
2
1
0
DDRF6 DDRF5 DDRF4 DDRF3 DDRF2 DDRF1
R
0
0
0
0
0
0
0
R
= Reserved
Figure 22-18. Data Direction Register F (DDRF)
Bit 0
DDRF0
0
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor
261