s908gr32ag3vfa Freescale Semiconductor, Inc, s908gr32ag3vfa Datasheet - Page 147

• Manufacturer Part Number: s908gr32ag3vfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

12.8 Port F
Port F is an 8-bit special-function port that shares four of its pins with the timer interface (TIM2) module.
12.8.1 Port F Data Register
The port F data register (PTF) contains a data latch for each of the eight port F pins.
PTF7–PTF0 — Port F Data Bits
Freescale Semiconductor
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
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 port F data.
DDRE
Bit
0
1
Alternate Function:
PTE
X
Bit
X
(1)
Address:
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
Reset:
Read:
Write:
READ DDRE ($000C)
WRITE DDRE ($000C)
WRITE PTE ($0008)
READ PTE ($0008)
Input, Hi-Z
T2CH5
$0440
PTF7
Bit 7
I/O Pin
Output
Mode
Figure 12-20. Port F Data Register (PTF)
= Unimplemented
(2)
T2CH4
Table 12-6. Port E Pin Functions
PTF6
RESET
Figure 12-19. Port E I/O Circuit
6
T2CH3
Accesses to DDRE
PTF5
DDRE5–DDRE0
DDRE5–DDRE0
5
Read/Write
DDREx
PTEx
T2CH2
Unaffected by reset
PTF4
4
PTF3
3
PTE5–PTE0
PTF2
Read
Pin
2
Accesses to PTE
PTF1
1
PTEx
PTE5–PTE0
PTE5–PTE0
PTF0
Bit 0
Write
(3)
Port F
147