MC68HC908AT32 Datasheet, PDF (30/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

General Description
(ADC). See Chapter 8 Clock Generator Module (CGM) and Chapter 26 Analog-to-Digital Converter
(ADC-15).
1.4.6 Analog Ground Pin (V_SSA)
The V_SSA 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. This will only supply the clock generator
module on the MC68HC08AZ32 emulator part. The analog sections consist of a clock generator module
(CGM) and an analog-to-digital converter (ADC) for the MC68HC08AS20 emulator part. See Chapter 8
Clock Generator Module (CGM) and Chapter 26 Analog-to-Digital Converter (ADC-15).
1.4.7 External Filter Capacitor Pin (CGMXFC)
CGMXFC is an external filter capacitor connection for the CGM. See Chapter 8 Clock Generator Module
(CGM).
1.4.8 Port A Input/Output (I/O) Pins (PTA7–PTA0)
PTA7–PTA0 are general-purpose bidirectional I/O port pins. See Chapter 22 MC68HC08AZ32 Emulator
Input/Output Ports or Chapter 27 MC68HC08AS20 Emulator Input/Output Ports depending on the
configuration.
1.4.9 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 Chapter 26 Analog-to-Digital Converter (ADC-15) and See Chapter 22 MC68HC08AZ32 Emulator
Input/Output Ports or Chapter 27 MC68HC08AS20 Emulator Input/Output Ports depending on the
configuration.
1.4.10 Port C I/O Pins (PTC5–PTC0)
PTC5–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 See Chapter 22 MC68HC08AZ32 Emulator
Input/Output Ports or Chapter 27 MC68HC08AS20 Emulator Input/Output Ports depending on the
configuration.
NOTE
PTC5 is available only in 64-pin packages.
1.4.11 Port D I/O Pins (PTD7/ATD15–PTD0/ATD8)
Port D is an 8-bit special-function port that shares all of its pins with the analog-to-digital converter module
(ADC-15), and one of its pins with the timer interface module (TIMA) if the part is configured as
MC68HC08AS20. If the part is configured as MC68HC08AZ32, then port D shares one of its pins with the
4-channel interface module (TIMA) and one of its pins with the 2-channel interface module (TIMB).
See Chapter 25 Timer Interface (TIM-6) and Chapter 26 Analog-to-Digital Converter (ADC-15) or Chapter
18 Timer Interface (TIMA-4), Chapter 19 Timer Interface (TIMB), and Chapter 21 Analog-to-Digital
Converter (ADC-8) depending on the configuration.
MC68HC908AT32 Data Sheet, Rev. 3.1
30
Freescale Semiconductor