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| MC68HC908GP32_08 Datasheet, PDF (26/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers | |||
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General Description
RST 1
PTC0 2
PTC1 3
PTC2 4
PTC3 5
PTC4 6
PTC5 7
PTC6 8
PTE0/TxD 9
PTE1/RxD 10
IRQ 11
33 PTA1/KBD1
32 PTA0/KBD0
31
VSSAD/VREFL
30
VDDAD/VREFH
29 PTB7/AD7
28 PTB6/AD6
27 PTB5/AD5
26 PTB4/AD4
25 PTB3/AD3
24 PTB2/AD2
23 PTB1/AD1
Figure 1-4. 44-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.
MC68HC908GP32 Data Sheet, Rev. 10
26
Freescale Semiconductor
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