UPD78F0138 NEC, UPD78F0138 Datasheet - Page 136

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

Notes 1.
Caution The RSTOP setting is valid only when “Can be stopped by software” is set for Ring-OSC by a mask
Remark MSTOP: Bit 7 of the main OSC control register (MOC)
136
Operation
Mode
Reset
STOP
HALT
2.
3.
4.
Status
option.
MCC:
RSTOP: Bit 0 of the Ring-OSC mode register (RCM)
MCM0:
Caution The RSTOP setting is valid only when “Can be stopped by software” is set for Ring-OSC
MSTOP = 1
MSTOP = 0
MCC = 1
MCC = 0
Note Setting X1 oscillator oscillating/stopped differs depending on the CPU clock used.
Remark MSTOP: Bit 7 of the main OSC control register (MOC)
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.
MSTOP = 0
• 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
Table 5-3. Relationship Between Operation Clocks in Each Operation Status
Stopped
Oscillating
MCC = 0
Note
Note
Bit 7 of the processor clock control register (PCC)
Bit 0 of the main clock mode register (MCM)
by a mask option.
Note
Note
MCC:
RSTOP: Bit 0 of the Ring-OSC mode register (RCM)
X1 Oscillator
Table 5-4. Oscillation Control Flags and Clock Oscillation Status
RSTOP = 0
RSTOP = 1
RSTOP = 0
RSTOP = 1
RSTOP = 0
RSTOP = 1
RSTOP = 0
RSTOP = 1
MSTOP = 1
Stopped
MCC = 1
Bit 7 of the processor clock control register (PCC)
Stopped
Setting prohibited
Oscillating
Stopped
Oscillating
Stopped
Oscillating Oscillating Stopped
CHAPTER 5 CLOCK GENERATOR
Note 1
User’s Manual U16228EJ2V0UD
Ring-OSC Oscillator
X1 Oscillator
RSTOP = 0 RSTOP = 1
Note 2
Subsystem
Oscillating
Oscillating
Stopped
Oscillating
Stopped
Oscillating
Stopped
Oscillating
Oscillator
Clock
Ring-OSC Oscillator
CPU Clock
Ring-OSC Stopped
Note 3
Note 4
Release
After
Supplied to Peripherals
MCM0 = 0 MCM0 = 1
Stopped
Ring-OSC X1
Prescaler Clock