MC68HC908GP32_08 Datasheet, PDF (27/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Pin Functions
MCU
V_DD
V_SS
C1
0.1 µF
+
C2
V_DD
NOTE: Component values shown
represent typical applications.
Figure 1-5. Power Supply Bypassing
1.5.2 Oscillator Pins (OSC1 and OSC2)
The OSC1 and OSC2 pins are the connections for the on-chip oscillator circuit. See Chapter 5 Clock
Generator Module (CGM).
1.5.3 External Reset Pin (RST)
A low 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. This pin contains an internal
pullup resistor. See Chapter 14 System Integration Module (SIM).
1.5.4 External Interrupt Pin (IRQ)
IRQ is an asynchronous external interrupt pin. This pin contains an internal pullup resistor.
See Chapter 9 External Interrupt (IRQ).
1.5.5 CGM Power Supply Pins (V_DDA and V_SSA)
V_DDA and V_SSA are the power supply pins for the analog portion of the clock generator module (CGM).
Connect the V_DDA pin to the same voltage potential as V_DD, and the V_SSA pin to the same voltage
potential as V_SS. Decoupling of these pins should be as per the digital supply. See Chapter 5 Clock
Generator Module (CGM)
1.5.6 External Filter Capacitor Pin (CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. See Chapter 5 Clock Generator Module
(CGM)
1.5.7 ADC Power Supply/Reference Pins (V_DDAD/V_REFH and V_SSAD/V_REFL)
V_DDAD and V_SSAD are the power supply pins for the analog-to-digital converter (ADC). Connect the V_DDAD
pin to the same voltage potential as V_DD, and the V_SSAD pin to the same voltage potential as V_SS.
MC68HC908GP32 Data Sheet, Rev. 10
Freescale Semiconductor
27