CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16315EJ1V0UD
117
(e) Select the X1 input clock oscillation stabilization time (2
11
/f
XP
, 2
13
/f
XP
, 2
14
/f
XP
, 2
15
/f
XP
, 2
16
/f
XP
) using the oscillation
stabilization time select register (OSTS) when releasing STOP mode while X1 input clock is being used as
the CPU clock. In addition, when releasing STOP mode while RESET is released and Ring-OSC clock is
being used as the CPU clock, check the X1 input clock oscillation stabilization time using the oscillation
stabilization time counter status register (OSTC).
A status transition diagram of this product is shown in Figure 5-13, and the relationship between the operation
clocks in each operation status and between the oscillation control flag and oscillation status of each clock are shown
in Tables 5-3 and 5-4, respectively.
Figure 5-13. Status Transition Diagram (1/4)
(1) When “Ring-OSC can be stopped by software” is selected by mask option
(when subsystem clock is not used)
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
HALT
Note 4
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Interrupt
Reset release
Interrupt
Interrupt
HALT
instruction
STOP
instruction
STOP
instruction
STOP
instruction
STOP
instruction
RSTOP = 0
RSTOP = 1
Note 1
MCM0 = 0
MCM0 = 1
Note 2
MSTOP = 1
Note 3
MSTOP = 0
HALT
instruction
HALT instruction
HALT
instruction
STOP
Note 4
Reset
Note 5
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 X1 input 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 a mask option, the watchdog timer
stops operating in the HALT and STOP modes, regardless of the source clock of the watchdog timer.
However, oscillation of Ring-OSC does not stop even in the HALT and STOP modes if RSTOP = 0.
5.
All reset sources (RESET input, POC, LVI, clock monitor, and WDT)