FUJITSU Semiconductor Controller MB89950/950A - Manual (Page 71)

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CHAPTER 3 CPU
3.7 Standby Mode (Low-power Consumption)
The standby mode consists of sleep mode and stop mode.
Main run mode is switched 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.
This section describes the relationship between standby mode and clock mode, and the
operation of various sections during standby.
■ Standby mode
Standby mode reduces the power consumption, however, by stopping the clock signal supply to the CPU
via clock controller (sleep mode), or by stopping the source oscillator itself (stop mode).
●
Sleep mode
Sleep mode stops the CPU and watchdog timer, but operate the peripheral functions.
●
Stop mode
Stop mode stops the CPU and peripheral functions. The main clock oscillator is stopped. Everything is shut
down except external interrupt service.