MC68HC908GR4MP datasheet(74/408 Pages) FREESCALE

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Resets and Interrupts

Technical Data

MC68HC908GR8 — Rev 4.0

Resets and Interrupts

MOTOROLA

•

Noise flag (NF) — NF is set when the SCI detects noise on

incoming data or break characters, including start, data, and stop

bits. The noise error interrupt enable bit, NEIE, enables NF to

generate SCI error CPU interrupt requests. NF is in SCI status

•

Framing error bit (FE) — FE is set when a logic 0 occurs where the

receiver expects a stop bit. The framing error interrupt enable bit,

FEIE, enables FE to generate SCI error CPU interrupt requests.

FE is in SCI status register 1. FEIE is in SCI control register 3.

•

Parity error bit (PE) — PE is set when the SCI detects a parity error

in incoming data. The parity error interrupt enable bit, PEIE,

enables PE to generate SCI error CPU interrupt requests. PE is in

SCI status register 1. PEIE is in SCI control register 3.

4.4.2.9 KBD0–KBD4 Pins

A logic 0 on a keyboard interrupt pin latches an external interrupt

request.

4.4.2.10 ADC (Analog-to-Digital Converter)

When the AIEN bit is set, the ADC module is capable of generating a

CPU interrupt after each ADC conversion. The COCO/IDMAS bit is not

used as a conversion complete flag when interrupts are enabled.

4.4.2.11 TBM (Timebase Module)

The timebase module can interrupt the CPU on a regular basis with a

rate defined by TBR2–TBR0. When the timebase counter chain rolls

over, the TBIF flag is set. If the TBIE bit is set, enabling the timebase

interrupt, the counter chain overflow will generate a CPU interrupt

request.

Interrupts must be acknowledged by writing a logic 1 to the TACK bit.

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