Clock Modes; Table 3.6-2 Operating States In Each Clock Mode - Fujitsu F2MC-8L Series Hardware Manual

CHAPTER 3 CPU
3.6.4

Clock Modes

There are two clock modes available: main clock and subclock modes.
In main clock mode, the main clock serves as the major operating clock. The main
clock speed can be switched by selecting one of the four different clock signals
produced by dividing the oscillation frequency (using the clock gear function).
In subclock mode, only the subclock serves as the operating clock with the main clock
stopping oscillation.
Operating States in Each Clock Mode

Table 3.6-2 Operating States in Each Clock Mode

Main clock
Clock speed SYCC
mode register (CS1,
CS0)
Fast
(1.1)
(1.0)
Main
clock
mode
(0.1)
(0.0)
Slow
68
Clock generation
Standby
Main Sub-
mode
clock clock
RUN
Oscil-
lating
Oscil-
Sleep
lating
Stop Off
RUN
Oscil-
lating
Sleep Oscil-
lating
Stop Off
RUN
Oscil-
lating
Sleep Oscil-
lating
Stop Off
RUN
Oscil-
lating
Sleep Oscil-
lating
Stop Off
Operating clock for each module
Time- Pe-
CPU base ripher-
timer als
F
/4
CH
F /2 F
CH
Off
Off
F /8
CH
F /2 F
CH
Off
Off
F /16
CH
F /2 F
CH CH
Off
Off
F /64
CH
F /2 F
CH CH
Off
Off
Standby
mode
wake-up
Watch
source
pre-
(other
scaler
than
reset)
Interrupt
/4
CH
requests
F
CL
External
Off
interrupt
Interrupt
/8
CH
requests
F
CL
External
Off
interrupt
Interrupt
/16
requests
F
CL
External
Off
interrupt
Interrupt
/64
requests
F
CL
External
Off
interrupt