upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 296

• Manufacturer Part Number: upd78f0103
• 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 Ring-OSC by a mask
Remark RSTOP: Bit 0 of the Ring-OSC mode register (RCM)
modes are available.
296
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
option.
MCM0:
When “Cannot be stopped” is selected for Ring-OSC by a mask option.
When “Can be stopped by software” is selected for Ring-OSC by a mask option.
Operates using the CPU clock at STOP instruction execution.
Operates using the CPU clock at HALT instruction execution.
Table 15-1. Relationship Between Operation Clocks in Each Operation Status
Stopped
Oscillating
Bit 0 of the main clock mode register (MCM)
X1 Oscillator
CHAPTER 15 STANDBY FUNCTION
Stopped
Oscillating
Note 1
User’s Manual U15836EJ5V0UD
Ring-OSC Oscillator
Oscillating
RSTOP = 0
Note 2
Stopped
RSTOP = 1
Ring-OSC
Note 3
Note 4
CPU Clock
Release
After
Stopped
Stopped
Ring-OSC
Prescaler Clock Supplied to
MCM0 = 0
Peripherals
X1
MCM0 = 1