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Chapter 25
Clock Monitor
User’s Manual U16702EE3V2UD00
25.4 Operation of Clock Monitor
This section explains the functions of the clock monitor. The start and stop conditions are as follows.
<Start condition>
Enabling operation by setting bit 0 (CLME) of the clock monitor mode register to 1
<Stop condition>
•
While oscillation stabilization time is being counted after software STOP mode is released
•
When the main clock is stopped
•
When the sampling clock is stopped (Ring-OSC)
•
When the CPU operates using Ring-OSC
Notes: 1.
Ring-OSC can be stopped by setting the RSTOP bit of the RCM register to 1
2.
The clock monitor is stopped while Ring-OSC is stopped.
(1)
Operation when main clock oscillation is stopped (CLME bit = 1)
If oscillation of the main clock is stopped when the CLME bit = 1, an internal reset signal is gener-
ated as shown in Figure 25-3.
Figure 25-3:
When Oscillation of Main Clock Is Stopped
Table 25-2:
Operation Status of Clock Monitor (When CLM.CLME Bit = 1,
During Ring-OSC Operation) (CKSEL Connected to Ring-OSC)
CPU operation
clock
Operation
Mode
Status of Main Clock
Status of Ring-OSC
Clock
Status of Clock Moni-
tor
Main clock
HALT mode
Oscillates
Oscillates
Note 1
Operates
Note 2
IDLE mode
STOP mode
Stops
Stops
Ring-OSC clock
-
Stops
Oscillates
Note 1
Stops
Reset
-
Stops
Stops
Stops
Main clock
Ring-OSC
Internal
reset signal
Four Ring Oscillation clocks
electronic components distributor
Содержание V850E/RS1
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