MC68HC705C Motorola, MC68HC705C Datasheet - Page 68

• Manufacturer Part Number: MC68HC705C
• Description: HCMOS Microcontroller Unit
• Manufacturer: Motorola

Low-Power Modes
Technical Data
68
NO
INTERRUPT
EXTERNAL
(IRQ)
YES
NO
1. FETCH RESET VECTOR
2. SERVICE INTERRUPT:
Figure 6-1. Stop/Wait Mode Function Flowchart
TURN ON OSCILLATOR
a. STACK
b. SET I BIT
c. VECTOR TO
DELAY TO STABILIZE
During stop mode, the I bit in the condition code register (CCR) is
cleared to enable external interrupts. All other registers and memory
remain unaltered. All input/output (I/O) lines remain unchanged. The
processor can be brought out of stop mode only by an external interrupt
or reset.
STOP OSCILLATOR
AND ALL CLOCKS
INTERRUPT ROUTINE
WAIT FOR TIME
CLEAR I BIT
RESET
STOP
OR
YES
Low-Power Modes
1. FETCH RESET VECTOR
2. SERVICE INTERRUPT:
CPU CLOCKS STOPPED
RESTART CPU CLOCK
a. STACK
b. SET I BIT
c. VECTOR TO
OSCILLATOR ACTIVE
TIMER, SCI, AND SPI
INTERRUPT ROUTINE
CLOCKS ACTIVE
CLEAR I BIT
RESET
WAIT
OR
YES
INTERRUPT
NO
EXTERNAL
(IRQ)
YES
YES
YES
YES
MC68HC705C8A — Rev. 2.0
INTERNAL TIMER
INTERNAL SCI
INTERNAL SPI
INTERRUPT
INTERRUPT
INTERRUPT
NO
NO
NO
MOTOROLA
NO