mc68hc908gt8 Freescale Semiconductor, Inc, mc68hc908gt8 Datasheet - Page 26

• Manufacturer Part Number: mc68hc908gt8
• Description: M68hc08 Microcontrollers
• 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.
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
PTE1/RxD
PTE0/TxD
PTC0
PTC1
PTC2
PTC3
PTC4
PTC5
PTC6
RST
IRQ
11
1
Figure 1-3. 44-Pin QFP Pin Assignments
2
3
4
5
6
7
8
9
10
DD
and V
SS
)
28
27
26
25
24
32
31
30
29
33
23
PTA1/KBD1
PTA0/KBD0
V
V
PTB7/AD7
PTB6/AD6
PTB5/AD5
PTB4/AD4
PTB3/AD3
PTB2/AD2
PTB1/AD1
REFL
REFH
Freescale Semiconductor
Figure 1-4