Datasheet

Analog-to-Digital Converter (ADC)
Interrupts
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Analog-to-Digital Converter (ADC) 83
5.4.5 Accuracy and Precision
The conversion process is monotonic and has no missing codes.
5.5 Interrupts
When the AIEN bit is set, the ADC module is capable of generating CPU
interrupts after each ADC conversion. A CPU interrupt is generated if the
COCO/IDMAS bit is at logic 0. If COCO/IDMAS bit is set, a DMA interrupt
is generated. The COCO/IDMAS bit is not used as a conversion
complete flag when interrupts are enabled.
5.6 Low-Power Modes
The WAIT and STOP instruction can put the MCU in low power-
consumption standby modes.
5.6.1 Wait Mode
The ADC continues normal operation during wait mode. Any enabled
CPU interrupt request from the ADC can bring the MCU out of wait
mode. If the ADC is not required to bring the MCU out of wait mode,
power down the ADC by setting ADCH4–ADCH0 bits in the ADC status
and control register before executing the WAIT instruction.
5.6.2 Stop Mode
The ADC module is inactive after the execution of a STOP instruction.
Any pending conversion is aborted. ADC conversions resume when the
MCU exits stop mode after an external interrupt. Allow one conversion
cycle to stabilize the analog circuitry.
5.7 I/O Signals
The ADC module has six pins shared with port B,
PTB5/AD5–PTB0/ATD0.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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