CM68HC05C4ACFB Motorola / Freescale Semiconductor, CM68HC05C4ACFB Datasheet - Page 35

• Manufacturer Part Number: CM68HC05C4ACFB
• Description: Microcontroller
• Manufacturer: Motorola / Freescale Semiconductor

General Release Specification — MC68HC05C4A
4.1 Contents
4.2 Introduction
MC68HC05C4A
MOTOROLA
—
Rev. 4.0
4.2
4.3
4.4
4.5
4.6
4.7
4.8
The MCU can be interrupted five different ways:
Port B interrupts, if enabled, are combined with the IRQ to form a single
interrupt source.
Interrupts cause the processor to save register contents on the stack
and to set the interrupt mask (I bit) to prevent additional interrupts. The
RTI (return to interrupt) instruction causes the register contents to be
recovered from the stack and normal processing to resume.
•
•
Four maskable hardware interrupts, IRQ (interrupt request), SPI
(serial peripheral interface), SCI (serial communications
interface), and timer
Non-maskable software interrupt instruction (SWI)
Introduction ...............................................................................35
Hardware Controlled Interrupt Sequence .................................37
Software Interrupt (SWI) ...........................................................37
External Interrupt (IRQ) ............................................................39
Timer Interrupt ..........................................................................39
Serial Communications Interrupt (SCI) .....................................39
Serial Peripheral Interrupt (SPI)................................................40
Interrupts
Section 4. Interrupts
General Release Specification
35