mc68hc705c9a Freescale Semiconductor, Inc, mc68hc705c9a Datasheet - Page 45

• Manufacturer Part Number: mc68hc705c9a
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 6
Low-Power Modes
6.1 Introduction
This section describes the low-power modes.
6.2 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.
During the stop mode, the TCR 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. The processor can be brought out of the stop mode only by an external interrupt or reset. See
Figure
Freescale Semiconductor
Notes:
6-1.
1. Represents the internal gating of the OSC1 pin
2. IRQ pin edge-sensitive mask option
3. IRQ pin level and edge-sensitive mask option
OSC1
RESET
IRQ
IRQ
INTERNAL
CLOCK
INTERNAL
ADDRESS
BUS
(2)
(3)
(1)
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Figure 6-1. Stop Recovery Timing Diagram
t RL
t LIH
t ILCH
3FFE
4064 t cyc
3FFE
3FFE
RESET OR INTERRUPT
VECTOR FETCH
3FFE
3FFF
45