CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16315EJ1V0UD
119
Figure 5-13. Status Transition Diagram (3/4)
(3) When “Ring-OSC cannot be stopped” is selected by mask option
(when subsystem clock is not used)
Status 3
CPU clock: f
XP
f
XP
: Oscillating
f
R
: Oscillating
HALT
Interrupt
Interrupt
Interrupt
STOP
instruction
MCM0 = 0
MCM0 = 1
Note 1
HALT
instruction
HALT
instruction
STOP
Note 3
Reset
Note 4
Status 2
CPU clock: f
R
f
XP
: Oscillating
f
R
: Oscillating
Status 1
CPU clock: f
R
f
XP
: Oscillation stopped
f
R
: Oscillating
Interrupt
STOP
instruction
Interrupt
Interrupt
STOP
instruction
MSTOP = 1
Note 2
MSTOP = 0
HALT instruction
Reset release
Notes 1.
Before shifting from status 2 to status 3 after reset and STOP are released, check the X1 input clock
oscillation stabilization time status using the oscillation stabilization time counter status register
(OSTC).
2.
When shifting from status 2 to status 1, make sure that MCS is 0.
3.
The watchdog timer operates using Ring-OSC even in STOP mode if “Ring-OSC cannot be stopped”
is selected by a mask option. Ring-OSC division can be selected as the count source of 8-bit timer
H1 (TMH1), so clear the watchdog timer using the TMH1 interrupt request before watchdog timer
overflow. If this processing is not performed, an internal reset signal is generated at watchdog timer
overflow after STOP instruction execution.
4.
All reset sources (RESET input, POC, LVI, clock monitor, and WDT)