CM68HC05C4ACFB Motorola / Freescale Semiconductor, CM68HC05C4ACFB Datasheet - Page 46

• Manufacturer Part Number: CM68HC05C4ACFB
• Description: Microcontroller
• Manufacturer: Motorola / Freescale Semiconductor

Low-Power Modes
6.3 Stop Mode
General Release Specification
46
N
INTERRUPT
EXTERNAL
(IRQ)
Y
N
1. FETCH RESET VECTOR
2. SERVICE INTERRUPT
TURN ON OSCILLATOR
DELAY TO STABILIZE
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 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 condition code register is cleared to
enable external interrupts. All other registers and memory remain
STOP OSCILLATOR
A. STACK
B. SET I BIT
C. VECTOR TO
AND ALL CLOCKS
WAIT FOR TIME
CLEAR I BIT
INTERRUPT
ROUTINE
Figure 6-1. Stop/Wait Mode Flowchart
RESET
STOP
OR
Y
Low-Power Modes
1. FETCH RESET VECTOR
2. SERVICE INTERRUPT
PROCESSOR CLOCKS STOPPED
PROCESSOR CLOCK
A. STACK
B. SET I BIT
C. VECTOR TO
TIMER CLOCK ACTIVE
OSCILLATOR ACTIVE
INTERRUPT
ROUTINE
RESTART
RESET
OR
WAIT
CLEAR I BIT
Y
INTERRUPT
N
EXTERNAL
(IRQ)
Y
Y
Y
MC68HC05C4A
INTERRUPT
INTERRUPT
INTERRUPT
N
TIMER
SCI
SPI
N
N
MOTOROLA
—
Rev. 4.0
N