mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 26

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.5 Pin Functions
Descriptions of the pin functions are provided here.
1.5.1 Power Supply Pins (V
V
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
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.
26
DD
and V
SS
are the power supply and ground pins. The MCU operates from a single power supply.
PTE1/RxD
PTE0/TxD
PTC0
PTC1
PTC2
PTC3
PTC4
PTC5
PTC6
RST
IRQ
11
1
2
3
4
5
6
7
8
9
10
Figure 1-4. 44-Pin QFP Pin Assignments
DD
MC68HC908GP32 Data Sheet, Rev. 10
and V
SS
)
32
31
30
29
28
27
26
25
24
23
33
PTA1/KBD1
PTA0/KBD0
V
V
PTB7/AD7
PTB6/AD6
PTB5/AD5
PTB4/AD4
PTB3/AD3
PTB2/AD2
PTB1/AD1
SSAD
DDAD
/V
/V
REFL
REFH
Freescale Semiconductor
Figure 1-5