s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 22

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

General Description
1.4 Pin Assignments
Figure 1-2
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.
22
DD
and V
SS
shows the pin assignments for the MC68HC908EY16.
are the power supply and ground pins. The MCU operates from a single power supply.
PTB7/AD7/TBCH1
PTB6/AD6/TBCH0
PTC4/OSC1
PTC3/OSC2
PTC2/MCLK
PTA2/KBD2
PTA1/KBD1
PTA0/KBD0
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
DD
1
and V
2
3
4
5
6
7
8
Figure 1-2. Pin Assignments
SS
)
24
23
22
21
20
19
18
17
PTE1/RxD
PTE0/TxD
PTC0/MISO
PTC1/MOSI
PTA5/SPSCK
PTA6/SS
PTB0/AD0
IRQ
Freescale Semiconductor
Figure 1-3