MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 28

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

General Description
1.4.1 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 shown in
Figure
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.
V
Peripheral Interface module (SPI). See
1.4.2 Oscillator Pins (OSC1 and OSC2)
The OSC1 and OSC2 pins are the connections for the on-chip oscillator circuit. See
Generator Module
1.4.3 External Reset Pin (RST)
A 0 on the RST pin forces the MCU to a known startup state. RST is bidirectional, allowing a reset of the
entire system. It is driven low when any internal reset source is asserted. See
Integration Module (SIM)
1.4.4 External Interrupt Pin (IRQ)
IRQ is an asynchronous external interrupt pin. See
28
DD
SS
is also the ground for the port output buffers and the ground return for the serial clock in the Serial
and V
1-6. Place the C1 bypass capacitor as close to the MCU as possible. Use a high-frequency
SS
are the power supply and ground pins. The MCU operates from a single power supply.
The following pin descriptions are just a quick reference. For a more
detailed representation, see
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
(CGM).
for more information.
V
SS
NOTE: Component values shown represent typical applications.
must be grounded for proper MCU operation.
DD
Figure 1-6. Power Supply Bypassing
and V
V
DD
V
Chapter 19 Serial Peripheral Interface
DD
SS
Chapter 22 Input/Output
)
MCU
0.1 μF
+
NOTE
NOTE
C1
C2
Chapter 17 External Interrupt Module
V
SS
Ports.
Chapter 9 System
(SPI).
Freescale Semiconductor
Chapter 10 Clock
(IRQ).