Motorola MC68HC05RC8 User Manual
MC68HC05RC16 — Rev. 3.0
General Release Specification
MOTOROLA
Low-Power Modes
53
General Release Specification — MC68HC05RC16
Section 6. Low-Power Modes
6.1 Contents
6.2 Introduction
This section describes the low-power modes.
6.3 Stop Mode
The STOP instruction places the MCU in its lowest power-consumption
mode. In stop mode, the internal oscillator is turned off, halting all
internal processing, including timer operation.
mode. In stop mode, the internal oscillator is turned off, halting all
internal processing, including timer operation.
During stop mode, the CTCSR ($08) bits are altered to remove any
pending timer interrupt request and to disable any further timer
interrupts. The timer prescaler is cleared. The I bit in the CCR is cleared
to enable external interrupts. All other registers and memory remain
unaltered. All input/output lines remain unchanged.
pending timer interrupt request and to disable any further timer
interrupts. The timer prescaler is cleared. The I bit in the CCR is cleared
to enable external interrupts. All other registers and memory remain
unaltered. All input/output lines remain unchanged.
NOTE:
The EIMSK bit is not cleared automatically by the execution of a STOP
instruction. Care should be taken to clear this bit before entering stop
mode.
instruction. Care should be taken to clear this bit before entering stop
mode.