MC908AB32CFUE Datasheet, PDF (329/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
When DDREx is a logic 1, reading address $0008 reads the PTEx data
latch. When DDREx is a logic 0, reading address $0008 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 17-6 summarizes the operation of the port E pins.
Table 17-6. Port E Pin Functions
DDRE
Bit
0
PTE Bit
X⁽¹⁾
I/O Pin
Mode
Input, Hi-Z⁽²⁾
Accesses
to DDRE
Read/Write
DDRE[7:0]
1
X
Output
DDRE[7:0]
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect the input.
Accesses to PTE
Read
Pin
PTE[7:0]
Write
PTE[7:0]⁽³⁾
PTE[7:0]
17.8 Port F
Port F is an 8-bit special function port that shares six of its pins with the
timer interface modules (TIMA and TIMB).
17.8.1 Port F Data Register (PTF)
The port F data register contains a data latch for each of the eight port F
pins.
Address: $0009
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
PTF7
PTF6
PTF5
PTF4
PTF3
PTF2
PTF1
PTF0
Reset:
Unaffected by reset
Alternative Function:
TBCH1 TBCH0 TBCH3 TBCH2 TACH3 TACH2
Additional Function: Input pullup Input pullup Input pullup Input pullup Input pullup Input pullup Input pullup Input pullup
Figure 17-18. Port F Data Register (PTF)
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
Input/Output (I/O) Ports
Technical Data
329