
General Description
MC68HC908GZ60 MC68HC908GZ48 MC68HC908GZ32 Data Sheet, Rev. 6
28
Freescale Semiconductor
Figure 1-4. 64-Pin QFP Pin Assignments
1.5 Pin Functions
Descriptions of the pin functions are provided here.
1.5.1 Power Supply Pins (VDD and VSS)
VDD and VSS are the power supply and ground pins. The MCU operates from a single power supply.
Fast signal transitions on MCU pins place high, short-duration current demands on the power supply. To
prevent noise problems, take special care to provide power supply bypassing at the MCU as
Figure 1-5shows. Place the C1 bypass capacitor as close to the MCU as possible. Use a high-frequency-response
ceramic capacitor for C1. C2 is an optional bulk current bypass capacitor for use in applications that
require the port pins to source high current levels.
PTE4
1
PTE1/RxD
PTE2
PTE5
PTF0
PTF1
PTF2
PTF6/
T2
CH4
PTF5
/T2
CH3
PTF4
/T2
CH2
PTD7
/T2
CH1
PTD6
/T2
CH0
PTD5
/T1
CH1
PTD4/T1C
H0
PTG1/AD17
PTG2/AD18
PTG3/AD19
PTC5
PTC6
PTB5/AD5
PTG0/AD16
PTA5/KBD5
/AD1
3
PTG4/AD20
OSC1
PTG7/AD23
PTG6/AD22
PTG5/AD21
PTA2/KBD2/AD10
PTA6
/KBD6
/AD1
4
PTA7/KBD7
/AD1
5
17
32
33
49
48
64
PTF3
IRQ
PTD0/SS/MCLK
16
PTD3/SPSCK
PTF7/
T2
CH5
PT
C2
PT
C3
PTC
4
VSSAD/VREFL
VDDAD/VREFH
PTB7/AD7
PTB6/AD6
PTC0
/CAN
TX
PTC
1/CA
N
RX
V
DDA
V
SSA
PTE3
PTD1/MISO
PTD2/MOSI
PT
B0/AD0
PTA0/KBD0/AD8
PTA1/KBD1/AD9
OSC2
CGMXFC
RST
PTE0/TxD
V
SS
V
DD
PT
B1/AD1
PT
B2/AD2
PTB4/AD4
PTB3/AD3
PTA4/KBD4
/AD1
2
PTA3/KBD3
/AD1
1
2
3
4
5
6
7
8
43
42
41
40
39
38
18
19
20
21
22
23
50
51
52
53
54
55
9
10
11
24
25
26
27
37
36
35
34
56
57
58
59
12
13
14
15
28
29
30
31
44
45
46
47
63
62
61
60