Datasheet

Section 5 Clock Pulse Generator
REJ09B0465-0300 Rev. 3.00 Page 125 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Table 5.4 shows the low-speed OCO, main oscillator, and sub-oscillator operation states in each
operating mode (system state).
Table 5.4 Clock Operation States in Each Operating Mode
System State System Clock Main Oscillator State
Low-Speed OCO
State
Sub-Oscillator
State
Reset released φloco Stopped Oscillating
φosc Depending on user
setting*
2
Oscillating
φloco Depending on user
setting*
1
Oscillating
Active mode,
sleep mode
φsub Depending on user
setting*
1
Oscillating
Standby mode None Stopped Oscillating
Oscillating*
3
Notes: 1. Can be set with the PMRJ[1:0] bits in PMRJ.
2. Backup operation is performed by selecting the oscillation stop with the PMRJ[1:0] bits
in PMRJ when the backup function is enabled.
3. A crystal resonator should be connected when a sub-oscillator clock is used. To switch
the system reference clock to φsub immediately after the power-on, oscillation settling
time for the sub-oscillator should be ensured.