Table 3.7 Standby Mode Operating States; Standby Modes (Low-Power Consumption) - Fujitsu F2MC-8L MB89620 Series Hardware Manual

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3.

Standby Modes (Low-power Consumption)

The standby modes consist of sleep mode and stop mode. Standby modes are
changed to sleep mode or stop mode by setting the standby control register (STBC).
Standby mode reduces the power consumption by stopping the operation of the CPU
and peripheral functions.
n Standby Modes
Standby mode reduce the power consumption by stopping the clock signal supply to the CPU
via clock controller (sleep mode) or by stopping the source oscillator itself (stop mode).
l Sleep Mode
Sleep mode stops the CPU, but continues to operate the peripheral functions except watchdog
timer.
Stop Mode
l
Stop mode stops all chip functions except the external interrupt, and stops also the source
oscillation.
n Standby Mode Operating States

Table 3.7 Standby Mode Operating States

Operating mode
Sleep
Stop (SPL = 0)
Stop (SPL = 1)
Oscillation
stabilization delay
time
*1: High impedance. Pins with a pull-up resistor (optional) go to the "H" level.
*2: During an oscillation stabilization delay initiated by an external interrupt, pins go to their states prior to entering stop
mode. Pins go to their reset states during an oscillation stabilization delay initiated by a reset. (See Section
3.5.3,"Pin States During Reset.")
66
CHAPTER 3 CPU
Timebase
Oscillation CPU
timer
Operating Stop Operating
Stop Stop Stop
Stop Stop Stop
Start Stop Operating
Watchdog Other
timer peripherals
Stop Operating Operating
Stop Stop
Stop Stop
Operating Operating
Method of
Pin
wake-up
Reset or interrupts
Reset or external
Hold
interrupt
Reset or external
Hi-z *1
interrupt
*2 —
Hold
MB89620 series