upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 311

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

17.4 Operation of Clock Monitor
This section explains the functions of the clock monitor. The monitor start and stop conditions are as follows.
<Monitor start condition>
< Monitor stop condition>
• Reset is released and during the oscillation stabilization time
• In STOP mode and during the oscillation stabilization time
• When the high-speed system clock is stopped by software (MSTOP = 1 or MCC = 1) and during the oscillation
• When the internal oscillation clock is stopped
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 17-3.
CPU Operation Clock
High-speed system
clock
Internal oscillation
clock
stabilization time
When bit 0 (CLME) of the clock monitor mode register (CLM) is set to operation enabled (1).
Remark MSTOP: Bit 7 of the main OSC control register (MOC)
selected by the option byte. If “Internal oscillator cannot be stopped” is selected, the internal oscillation
clock cannot be stopped.
Table 17-2. Operation Status of Clock Monitor (When CLME = 1)
STOP mode
RESET input
Normal operation
mode
HALT mode
STOP mode
RESET input
Normal operation
mode
HALT mode
Operation Mode
CHAPTER 17 CLOCK MONITOR
High-Speed System Clock
Stopped
Oscillating
Stopped
Oscillating
Stopped
User’s Manual U16846EJ3V0UD
Status
Internal Oscillation Clock
Oscillating
Stopped
Oscillating
Stopped
Oscillating
Stopped
Oscillating
Note
Note
Note
Status
Stopped
Operating
Stopped
Stopped
Operating
Stopped
Clock Monitor Status
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