Fujitsu F2MC-8FX Hardware Manual page 62

CHAPTER 6 CLOCK CONTROLLER
Standby Modes
The clock controller selects whether to enable or disable clock oscillation and clock supply to internal
circuitry depending on each standby mode. With the exception of timebase timer mode and watch mode,
the standby mode can be set independently of the clock mode.
Table 6.1-3 shows the relationships between standby modes and clock supply states.
Table 6.1-3 Standby Modes and Clock Supply States
Standby Mode
Timebase timer mode
(Two-system clock
product only)
48
Stops clock supply to the CPU and watchdog timer. As a result, the CPU stops operation,
Sleep mode
but other peripheral resources continue operating.
Supplies clock signals only to the timebase timer, watch prescaler, and watch counter
while stopping clock supply to other circuits. As a result, all the functions other than the
timebase timer, watch prescaler, watch counter, external interrupt, and low-voltage
detection reset are stopped.
Timebase timer mode is only the standby mode for main clock mode or main PLL clock
mode.
Stops main clock oscillation, but supplies clock signals only to the watch prescaler and
Watch mode watch counter while stopping clock supply to other circuits. As a result, all the functions
other than the watch prescaler, watch counter, external interrupt, and low-voltage
detection reset are stopped.
Watch mode is only the standby mode for subclock mode.
Stops main clock oscillation and subclock oscillation and stops the supply of all clock
Stop mode signals. As a result, all the functions other than external interrupt and low-voltage
detection reset are stopped.
Clock Supply States