MC68HC05P9A Datasheet, PDF (59/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Contents
Stop Mode
Low-Power Modes
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Halt Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
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 pin or a high-to-low
transition on the IRQ 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.
5-mc68hc05p9a
MOTOROLA
Low-Power Modes
59
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