s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 23

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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 logic 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
1.4.5 Analog Power Supply Pin (V
V
Chapter 8 Clock Generator Module
Freescale Semiconductor
DD
SS
DDA
is also the ground for the port output buffers and the ground return for the serial clock in the Serial
and V
is the power supply pin for the analog portion of the Clock Generator Module (CGM). See
1-3. 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.
V
SS
(CGM).
must be grounded for proper MCU operation.
NOTE: Component values shown represent typical applications.
for more information.
DD
Figure 1-3. Power Supply Bypassing
MC68HC908AZ32A Data Sheet, Rev. 2
(CGM).
and V
V
Chapter 17 Serial Peirpheral Interface
DD
DDA
V
DD
SS
)
)
NOTE
MCU
0.1 μF
+
C1
C2
Chapter 15 External Interrupt Module
V
SS
(SPI).
Chapter 8 Clock
Chapter 7 System
Pin Assignments
(IRQ1).
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