68HC705SP7 datasheet(73/230 Pages) FREESCALE

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Operating Modes

Low-Power Modes

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

General Release Specification

Operating Modes

6.4.1 Stop Mode

The STOP instruction puts the MCU in a mode with the lowest power

consumption and affects the MCU as follows:

•

Turns off the CPU clock and all internal clocks by stopping both

the external pin oscillator and the internal low-power oscillator.

The selection of the oscillator by the OM1 and OM2 bits in the

ISCR is not affected. The stopped clocks turn off the COP

watchdog, the core timer, the programmable timer, the analog

subsystem, and the SIOP.

•

Removes any pending core timer interrupts by clearing the core

timer interrupt flags (CTOF and RTIF) in the core timer status and

control register (CTSCR)

•

Disables any further core timer interrupts by clearing the core

timer interrupt enable bits (CTOFE and RTIE) in the CTSCR

•

Removes any pending programmable timer interrupts by clearing

the timer interrupt flags (ICF, OCF, and TOF) in the timer status

•

Disables any further programmable timer interrupts by clearing the

timer interrupt enable bits (ICIE, OCIE, and TOIE) in the timer

control register (TCR).

•

Enables external interrupts via the IRQ/VPP pin by setting the

IRQE bit in the IRQ status and control register (ISCR). External

interrupts are also enabled via the PA0 through PA3 pins, if the

port A interrupts are enabled by the PIRQ bit in the mask option

•

Enables interrupts in general by clearing the I bit in the condition

code register

The STOP instruction does not affect any other bits, registers, or I/O

lines.

The following conditions bring the MCU out of stop mode:

•

An external interrupt signal on the IRQ/VPP pin — A high-to-low

transition on the IRQ/VPP pin loads the program counter with the

contents of locations $1FFA and $1FFB.

Freescale Semiconductor, Inc.

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