MC68HC08AS32 Datasheet, PDF (23/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

1.4.4 External Interrupt Pin (IRQ)
IRQ is an asynchronous external interrupt pin. (See Section 8. External Interrupt
(IRQ).)
1.4.5 Analog Power Supply Pin (V_DDA/V_DDAREF)
V_DDA/V_DDAREF is the power supply pin for the analog portion of the chip. These
modules are the analog-to-digital converter (ADC) and the clock generator module
(CGM). (See Section 5. Clock Generator Module (CGM) and Section 3.
Analog-to-Digital Converter (ADC).)
1.4.6 ADC High Reference Pin (V_REFH)
V_REFH is the high reference voltage for all analog-to-digital conversions. (See
Section 3. Analog-to-Digital Converter (ADC).)
1.4.7 Analog Ground Pin (V_SSA/V_REFL)
The V_SSA/V_REFL analog ground pin is used only for the ground connections for the
analog sections of the circuit and should be decoupled as per the V_SS digital
ground pin. The analog sections consist of a clock generator module (CGM) and
an analog-to-digital converter (ADC). V_SSA/V_REFL is also the lower reference
supply for the ADC. (See Section 5. Clock Generator Module (CGM) and
Section 3. Analog-to-Digital Converter (ADC).)
1.4.8 External Filter Capacitor Pin (CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. (See Section 5.
Clock Generator Module (CGM).)
1.4.9 Port A Input/Output (I/O) Pins (PTA7–PTA0)
PTA7–PTA0 are general-purpose bidirectional I/O port pins. (See Section 11.
Input/Output (I/O) Ports.)
1.4.10 Port B I/O Pins (PTB7/ATD7–PTB0/ATD0)
Port B is an 8-bit special function port that shares all eight pins with the
analog-to-digital converter (ADC). (See Section 3. Analog-to-Digital Converter
(ADC) and Section 11. Input/Output (I/O) Ports.)
1.4.11 Port C I/O Pins (PTC4–PTC0)
PTC4–PTC3 and PTC1–PTC0 are general-purpose bidirectional I/O port pins.
PTC2/MCLK is a special function port that shares its pin with the system clock.
(See Section 11. Input/Output (I/O) Ports.)
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor
Data Sheet
23