MC68HC705P9 Datasheet, PDF (75/160 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
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/V_PP pin — A high-to-low
transition on the IRQ/V_PP 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.
MC68HC705P9 — Rev. 4.0
MOTOROLA
Low Power Modes
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Technical Data
75