CHAPTER 5 CLOCK GENERATOR
User’s Manual U16899EJ2V0UD
125
Figure 5-13. Status Transition Diagram (2/4)
(2) When “Ring-OSC can be stopped by software” is selected by option byte
(when subsystem clock is used)
HALT
Note 4
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
HALT
instruction
HALT
instruction
STOP
instruction
STOP
instruction
STOP
instruction
RSTOP = 0
RSTOP = 1
Note 1
MCC = 0
CSS = 0
Note 5
MCC = 1
CSS = 1
Note 5
MCM0 = 0
MCM0 = 1
Note 2
MSTOP = 1
Note 3
MSTOP = 0
HALT
instruction
HALT
instruction
STOP
Note 4
Reset
Note 6
Status 4
CPU clock: f
XP
f
XP
: Oscillating
f
R
: Oscillation
stopped
Status 3
CPU clock: f
XP
f
XP
: Oscillating
f
R
: Oscillating
Status 1
CPU clock: f
R
f
XP
: Oscillation
stopped
f
R
: Oscillating
Status 2
CPU clock: f
R
f
XP
: Oscillating
f
R
: Oscillating
Reset release
Interrupt
HALT
instruction
Status 6
CPU clock: f
XT
f
XP
: Oscillation
stopped
f
R
: Oscillating/
oscillation
stopped
Status 5
CPU clock: f
XT
f
XP
: Oscillating
f
R
: Oscillating/
oscillation
stopped
Notes 1. When shifting from status 3 to status 4, make sure that bit 1 (MCS) of the main clock mode register
(MCM) is 1.
2. Before shifting from status 2 to status 3 after reset and STOP are released, check the high-speed
system clock oscillation stabilization time status using the oscillation stabilization time counter status
register (OSTC).
3. When shifting from status 2 to status 1, make sure that MCS is 0.
4. When “Ring-OSC can be stopped by software” is selected by the option byte, the clock supply to the
watchdog timer is stopped after the HALT or STOP instruction has been executed, regardless of the
setting of bit 0 (RSTOP) of the Ring-OSC mode register (RCM) and bit 0 (MCM0) of the main clock
mode register (MCM).
5. The operation cannot be shifted between subsystem clock operation and Ring-OSC operation.
6. All reset sources (RESET input, POC, LVI, clock monitor, and WDT)
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