Preliminary User’s Manual U16846EJ1V0UD
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CHAPTER 15 STANDBY FUNCTION
15.1 Standby Function and Configuration
15.1.1 Standby function
Table 15-1. Relationship Between Operation Clocks in Each Operation Status
Ring-OSC Oscillator
Prescaler Clock Supplied to
Peripherals
Note 2
Status
Operation
Mode
High-Speed
System Clock
Oscillator
Note 1
RSTOP = 0
RSTOP = 1
CPU Clock
After
Release
MCM0 = 0
MCM0 = 1
Reset Stopped
Ring-OSC
Stopped
STOP
Stopped
Note 3
Stopped
HALT Oscillating
Oscillating Oscillating Stopped
Note 4
Ring-OSC
High-speed
system clock
Notes 1. When “Cannot be stopped” is selected for Ring-OSC by the option byte.
2. When “Can be stopped by software” is selected for Ring-OSC by the option byte.
3. Operates using the CPU clock at STOP instruction execution.
4. Operates using the CPU clock at HALT instruction execution.
Caution The RSTOP setting is valid only when “Can be stopped by software” is set for Ring-OSC by the
option byte.
Remark RSTOP: Bit 0 of the Ring-OSC mode register (RCM)
MCM0:
Bit 0 of the main clock mode register (MCM)
The standby function is designed to reduce the operating current consumption of the system. The following two
modes are available.