ST6208C/ST6209C/ST6210C/ST6220C
STOP MODE (Cont’d)
Figure 22. STOP Mode Flowchart
STOP INSTRUCTION
ENABLE
WATCHDOG
DISABLE
1
EXCTNL
1)
VALUE
0
LEVEL
ON
OSCILLATOR
Off
1
2)
Clock to PERIPHERALS No
0
NMI PIN
Clock to CPU
No
N
RESET
OSCILLATOR
On
Clock to PERIPHERALS Yes
Clock to CPU No
N
3)
Y
INTERRUPT
Y
OSCILLATOR
Restart
Clock to PERIPHERALS Yes
Clock to CPU Yes
Y
N
RESET
2048
CLOCK CYCLE
N
DELAY
INTERRUPT
OSCILLATOR
On
Y
Clock to PERIPHERALS Yes
Clock to CPU Yes
FETCH RESET VECTOR
OR SERVICE INTERRUPT
Notes:
1. EXCTNL is an option bit. See option byte section for more details.
2. Peripheral clocked with an external clock source can still be active.
3. Only some specific interrupts can exit the MCU from STOP mode (such as external interrupt). Refer to
the Interrupt Mapping table for more details.
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