upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 291

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

15.1 Standby Function and Configuration
15.1.1 Standby function
Notes 1.
Caution The RSTOP setting is valid only when “Can be stopped by software” is set for the internal oscillator
Remark MSTOP: Bit 7 of the main OSC control register (MOC)
modes are available.
Operation
Mode
Reset
STOP
HALT
The standby function is designed to reduce the operating current consumption of the system. The following two
2.
3.
4.
Status
by the option byte.
RSTOP: Bit 0 of the internal oscillation mode register (RCM)
MCM0:
When “Cannot be stopped” is selected for the internal oscillator by the option byte.
When “Can be stopped by software” is selected for the internal oscillator by the option byte.
Operates using the CPU clock at STOP instruction execution.
Operates using the CPU clock at HALT instruction execution.
MSTOP = 0 MSTOP = 1
Stopped
Oscillating
Table 15-1. Relationship Between Operation Clocks in Each Operation Status
High-Speed System
Clock Oscillator
Bit 0 of the main clock mode register (MCM)
Stopped
CHAPTER 15 STANDBY FUNCTION
Stopped
Oscillating
Note 1
User’s Manual U16846EJ3V0UD
Internal Oscillator
Oscillating
RSTOP = 0
Note 2
Stopped
RSTOP = 1
Internal
oscillation
Note 3
Note 4
CPU Clock
Release
After
Stopped
Stopped
Internal
oscillation
Prescaler Clock Supplied to
MCM0 = 0
Peripherals
High-speed
system clock
MCM0 = 1
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