CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16315EJ1V0UD
121
Table 5-3. Relationship Between Operation Clocks in Each Operation Status
Ring-OSC Oscillator
Prescaler Clock Supplied
to Peripherals
Note 2
Status
Operation
Mode
X1
Oscillator
Note 1
RSTOP = 0
RSTOP = 1
Subsystem
Clock
Oscillator
CPU Clock
After
Release
MCM0 = 0
MCM0 = 1
Reset
Stopped
Stopped
Ring-OSC
Stopped
STOP
Stopped
Note 3
Stopped
HALT
Oscillating
Oscillating
Oscillating
Stopped
Oscillating
Note 4
Ring-OSC
X1
Caution
The RSTOP setting is valid only when “Can be stopped by software” is set for Ring-OSC by a mask
option.
Notes 1.
When “Cannot be stopped” is selected for Ring-OSC by a mask option.
2.
When “Can be stopped by software” is selected for Ring-OSC by a mask option.
3.
Operates using the CPU clock at STOP instruction execution.
4.
Operates using the CPU clock at HALT instruction execution.
Remark
RSTOP: Bit 0 of the Ring-OSC mode register (RCM)
MCM0:
Bit 0 of the main clock mode register (MCM)
Table 5-4. Oscillation Control Flags and Clock Oscillation Status
X1 Oscillator
Ring-OSC Oscillator
RSTOP = 0
Stopped
Oscillating
MSTOP = 1
Note
RSTOP = 1
Setting prohibited
RSTOP = 0
Oscillating
MSTOP = 0
Note
RSTOP = 1
Oscillating
Stopped
RSTOP = 0
Oscillating
MCC = 1
Note
RSTOP = 1
Stopped
Stopped
RSTOP = 0
Oscillating
MCC = 0
Note
RSTOP = 1
Oscillating
Stopped
Note
Setting X1 oscillator oscillating/stopped differs depending on the CPU clock used.
•
When the Ring-OSC clock is used as the CPU clock: Set using the MSTOP bit
•
When the subsystem clock is used as the CPU clock: Set using the MCC bit
Caution
The RSTOP setting is valid only when “Can be stopped by software” is set for Ring-OSC
by a mask option.
Remark
MSTOP: Bit 7 of the main OSC control register (MOC)
MCC:
Bit 7 of the processor clock control register (PCC)
RSTOP: Bit 0 of the Ring-OSC mode register (RCM)