upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 369

• Manufacturer Part Number: upd78f0124m6gba1-8et
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

20.4 Operation of Clock Monitor
CPU Operation Clock
X1 input clock
Internal oscillation
clock
This section explains the functions of the clock monitor. The monitor start and stop conditions are as follows.
<Monitor start condition>
<Monitor stop condition>
Note The internal oscillation clock is stopped only when the “Internal oscillator can be stopped by software” is
The clock monitor timing is as shown in Figure 20-3.
• Reset is released and during the oscillation stabilization time
• In STOP mode and during the oscillation stabilization time
• When the X1 input clock is stopped by software (MSTOP = 1 or MCC = 1) and during the oscillation
When bit 0 (CLME) of the clock monitor mode register (CLM) is set to operation enabled (1).
• When the internal oscillation clock is stopped
Remark MSTOP: Bit 7 of the main OSC control register (MOC)
stabilization time
selected by a mask option. If “Internal oscillator cannot be stopped” is selected, the internal oscillation clock
cannot be stopped.
MCC:
STOP mode
RESET input
Normal operation mode
HALT mode
STOP mode
RESET input
Normal operation mode
HALT mode
Table 20-2. Operation Status of Clock Monitor (When CLME = 1)
Bit 7 of the processor clock control register (PCC)
Operation Mode
CHAPTER 20 CLOCK MONITOR
User’s Manual U16315EJ3V1UD
Stopped
Oscillating
Stopped
Oscillating
Stopped
X1 Input Clock Status
Oscillating
Stopped
Oscillating
Stopped
Oscillating
Stopped
Oscillating
Internal Oscillation Clock
Note
Note
Note
Status
Stopped
Operating
Stopped
Stopped
Operating
Stopped
Clock Monitor Status
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