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| MC68HC908EY16 Datasheet, PDF (22/278 Pages) Motorola, Inc – Microcontrollers | |||
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General Description
1.4 Pin Assignments
Figure 1-2 shows the pin assignments for the MC68HC908EY16.
PTA2/KBD2 1
PTA1/KBD1 2
PTA0/KBD0 3
PTB7/AD7/TBCH1 4
PTB6/AD6/TBCH0 5
PTC4/OSC1 6
PTC3/OSC2 7
PTC2/MCLK 8
24 PTE1/RxD
23 PTE0/TxD
22 PTC0/MISO
21 PTC1/MOSI
20 PTA5/SPSCK
19 PTA6/SS
18 PTB0/AD0
17 IRQ
Figure 1-2. 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 1-3
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.
MC68HC908EY16 ⢠MC68HC908EY8 Data Sheet, Rev. 10
22
Freescale Semiconductor
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