MC68HC705P9CS datasheet(75/160 Pages) FREESCALE

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MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Low Power Modes

Technical Data — MC68HC705P9

Section 6. Low Power Modes

6.1 Contents

6.2

Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

6.3

Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

6.4

Data-Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

6.2 Stop Mode

The STOP instruction puts the MCU in its lowest power-consumption

mode and has the following effects on the MCU:

•

Stops the internal oscillator, the CPU clock, and the internal clock,

turning off the capture/compare timer, the COP watchdog, the

SIOP, and the ADC

•

Clears the I bit in the condition code register, enabling external

interrupts

•

Clears the ICIE, OCIE, and TOIE bits in the timer control register,

disabling further timer interrupts

The STOP instruction does not affect any other registers or any I/O lines.

The following events 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. The timer resumes

counting from the last value before the STOP instruction.

•

External reset — A logic zero on the RESET pin resets the MCU

and loads the program counter with the contents of locations

$1FFE and $1FFF. The timer begins counting from $FFFC.

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