MC908JL3ECPE Datasheet, PDF (110/180 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
10.4 Port D
Port D is an 8-bit special function port that shares two of its pins with timer interface module,
(see Chapter 8 Timer Interface Module (TIM)) and shares four of its pins with analog-to-digital converter
module (see Chapter 9 Analog-to-Digital Converter (ADC)). PTD6 and PTD7 each has high current drive
(25mA sink) and programmable pull-up. PTD2, PTD3, PTD6 and PTD7 each has LED driving (sink)
capability.
NOTE
PTD0–PTD1 are available on MC68H(R)C908JL3E only.
10.4.1 Port D Data Register (PTD)
The port D data register contains a data latch for each of the eight port D pins.
Address:
Read:
Write:
Reset:
Additional Functions:
$0003
Bit 7
PTD7
LED
(Sink)
6
PTD6
LED
(Sink)
5
PTD5
25mA sink 25mA sink
(Slow Edge) (Slow Edge)
5k pull-up 5k pull-up
TCH1
4
3
PTD4
PTD3
Unaffected by reset
LED
(Sink)
ADC8
TCH0
2
PTD2
1
PTD1
Bit 0
PTD0
LED
(Sink)
ADC9
ADC10 ADC11
= Unimplemented
Figure 10-9. Port D Data Register (PTD)
PTD[7:0] — Port D Data Bits
These read/write bits are software programmable. Data direction of each port D pin is under the control
of the corresponding bit in data direction register D. Reset has no effect on port D data.
ADC[11:8] — ADC channels 11 to 8
ADC[11:8] are pins used for the input channels to the analog-to-digital converter module. The channel
select bits, ADCH[4:0], in the ADC status and control register define which port pin will be used as an
ADC input and overrides any control from the port I/O logic. See Chapter 9 Analog-to-Digital Converter
(ADC).
TCH[1:0] — Timer Channel I/O
The TCH1 and TCH0 pins are the TIM input capture/output compare pins. The edge/level select bits,
ELSxB:ELSxA, determine whether the PTD4/TCH0 and PTD5/TCH1 pins are timer channel I/O pins
or general-purpose I/O pins. See Chapter 8 Timer Interface Module (TIM).
MC68HC908JL3E Family Data Sheet, Rev. 4
110
Freescale Semiconductor