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iPac HCS12 Manual.doc
- 5 -
Rev 1.2 - 11/11/03
2.4 Processor Based Multi-Purpose Digital I/O
These GPIO lines are exactly that, general purpose. They are connected directly to the processor, so use caution when
interfacing to these lines. The names of each line listed in Table 2 matches the port line on HCS 12 processor.
When used as outputs these lines can drive 10 ma. and when used as inputs the input voltage should not exceed 5 Vdc.
Besides being bit configurable I/O lines they can also be used as PWMs, and PT lines can be used as 16 bit counters. For
software purposes PT is referred to as GP port 0, and PP is GP port 1.
Table 2: PROCESSOR BASED DIGITAL I/O Connector (HDR3)
Pin
Signal
Pin
Signal
1
PH3
2
GND
3
PH2
4
GND
5
PP5
6
GND
7
PP4
8
GND
9
PP3
10
GND
11
PP2
12
GND
13
PP1
14
GND
15
PP0
16
GND
17
PT7
18
GND
19
PT6
20
GND
21
PT5
22
GND
23
PT4
24
GND
25
PT3
26
GND
27
PT2
28
GND
29
PT1
30
GND
31
PT0
32
GND
33
PA7
34
GND
35
PA6
36
GND
37
PA5
38
GND
39
PA4
40
GND
41
PA3
42
GND
43
PA2
44
GND
45
PA1
46
GND
47
PA0
48
GND
49
5V(Vcc)
50
GND
