Filter
Top Products
62
CHAPTER 3 CPU
3.7 Standby Mode (Low-Power Consumption Mode)
The MB89202/F202RA series supports sleep mode and stop mode in standby mode.
Transition to standby mode is controlled by the standby control register (STBC)
settings.
In active mode, transition to sleep mode or stop mode is allowed.
In standby mode, operation of the CPU and peripheral functions is stopped to reduce
power consumption.
This section describes the relationship between standby mode and clock mode and
explains block operations in standby mode.
■ Standby Mode
In active mode, power consumption is reduced by lowering the speed of the operating clock for the CPU
and peripheral circuits using clock speed switching (gears). However, in standby mode, the clock controller
stops supply of the clock to the CPU (sleep mode) or stops oscillation of the source (stop mode) to reduce
power consumption.
● Sleep mode
In sleep mode, the CPU and watchdog timer are stopped. Peripheral functions operate using the normal
clock.
● Stop mode
In stop mode, the CPU and peripheral functions are stopped, and the clock does not oscillate. All the
functions except for external interrupt halt.