HC705E5GRSSLASHD datasheet(40/148 Pages) NXP

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Interrupts

General Release Specification

MC68HC705E5 — Rev. 1.0

Interrupts

4.8 Synchronous Serial Interface Interrupt (SSI)

The SSI flag and enable bits are located in the SSI control (SCR) and

status (SSR) registers. An SSI interrupt will vector to the interrupt service

routine located at the address specified by the contents of memory

locations $1FF4 and $1FF5. For additional information, refer to 12.4 SSI

Registers.

4.9 M-Bus (I2C) Interrupt (M Bus)

The MIF flag and enable bits are located in the M-bus status (MSR) and

control (MCR) registers. An M-bus interrupt will vector to the interrupt

service routine located at the address specified by the contents of

memory locations $1FF2 and $1FF3. For further information, refer to

11.6 M-Bus Registers.

4.10 Operation During Stop Mode

The timer system is cleared and the CPI counter is halted when going

into stop mode. When stop mode is exited by an external interrupt or an

external RESET, the internal oscillator will resume, followed by a

4064-cycle internal processor oscillator stabilization delay. The timer

system counter is then cleared and operation resumes. The CPI will

continue counting once the oscillator resumes and does not wait for the

oscillator to stabilize.

4.11 Operation During Wait Mode

The CPU clock halts during wait mode, but the timer and CPI remain

active. A timer interrupt or custom periodic interrupt, SSI, and M bus will

cause the processor to exit wait mode if the interrupts are enabled.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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