M68ICS08GR datasheet(71/408 Pages) FREESCALE

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Resets and Interrupts

Interrupts

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Resets and Interrupts

4.4.2.1 SWI Instruction

The software interrupt instruction (SWI) causes a non-maskable

interrupt.

NOTE:

A software interrupt pushes PC onto the stack. An SWI does not push

PC – 1, as a hardware interrupt does.

4.4.2.2 Break Interrupt

The break module causes the CPU to execute an SWI instruction at a

software-programmable break point.

4.4.2.3 IRQ Pin

A logic 0 on the IRQ1 pin latches an external interrupt request.

4.4.2.4 CGM

The CGM can generate a CPU interrupt request every time the phase-

locked loop circuit (PLL) enters or leaves the locked state. When the

LOCK bit changes state, the PLL flag (PLLF) is set. The PLL interrupt

enable bit (PLLIE) enables PLLF CPU interrupt requests. LOCK is in the

PLL bandwidth control register. PLLF is in the PLL control register.

4.4.2.5 TIM1

TIM1 CPU interrupt sources:

•

TIM1 overflow flag (TOF) — The TOF bit is set when the TIM1

counter value rolls over to $0000 after matching the value in the

TIM1 counter modulo registers. The TIM1 overflow interrupt

enable bit, TOIE, enables TIM1 overflow CPU interrupt requests.

TOF and TOIE are in the TIM1 status and control register.

•

TIM1 channel flags (CH1F–CH0F) — The CHxF bit is set when an

input capture or output compare occurs on channel x. The channel

x interrupt enable bit, CHxIE, enables channel x TIM1 CPU

interrupt requests. CHxF and CHxIE are in the TIM1 channel x

status and control register.

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