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| MC908GR32AVFAE Datasheet, PDF (25/314 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Pin Functions
RST 1
64
49
63 62 61 60 59 58 57 56 55 54 53 52 51 50
48 PTA2/KBD2/AD10
PTE0/TxD 2
47 PTA1/KBD1/AD9
PTE1/RxD 3
PTE2 4
46 PTA0/KBD0/AD8
45 PTC6
PTE3 5
44 PTC5
PTE4 6
43 PTG3/AD19
PTE5 7
42 PTG2/AD18
PTF0 8
41 PTG1/AD17
PTF1 9
40 PTG0/AD16
PTF2 10
PTF3 11
IRQ 12
39
VSSAD/VREFL
38
VDDAD/VREFH
37 PTB7/AD7
PTD0/SS/MCLK 13
36 PTB6/AD6
PTD1/MISO 14
35 PTB5/AD5
PTD2/MOSI 15
34 PTB4/AD4
PTD3/SPSCK 16
18 19 20 21 22 23 24 25 26 27 28 29 30 31
17
32
33 PTB3/AD3
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 1-5
shows. 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.
MC68HC908GR60A ⢠MC68HC908GR48A ⢠MC68HC908GR32A Data Sheet, Rev. 5
Freescale Semiconductor
25
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