S128 Datasheet, PDF (52/107 Pages) Renesas Technology Corp – Microcontroller

S128
2. Electrical Characteristics
Table 2.21 Clock timing (2 of 2)
Parameter
Symbol
Min
Typ
Max
Unit
Test conditions
Sub-clock oscillation stabilization time*²
t_SUBOSC
-
0.5
-
s
Figure 2.28
Note 1. Time until the clock can be used after the main clock oscillator stop bit (MOSCCR.MOSTP) is set to 0 (operating)
when the external clock is stable.
Note 2. After changing the setting of the SOSCCR.SOSTP bit to start sub-clock oscillator operation, only start using the
sub-clock oscillator after the sub-clock oscillation stabilization wait time elapsed. Use the oscillator wait time
value recommended by the oscillator manufacturer.
Note 3. The 48-MHz HOCO can be used within a VCC range of 1.8 V to 5.5 V.
Note 4. The 64-MHz HOCO can be used within a VCC range of 2.4 V to 5.5 V.
Note 5. This is a characteristic when the HOCOCR.HCSTP bit is cleared to 0 (oscillation) in the MOCO stop state.
When the HOCOCR.HCSTP bit is cleared to 0 (oscillation) during MOCO oscillation, this specification is
shortened by 1 μs.
Note 6. Check OSCSF.HOCOSF to confirm whether stabilization time has elapsed.
EXTAL external clock input
t_Xr
Figure 2.25 EXTAL external clock input timing
t_Xcyc
t_XH
t_XL
t_Xf
VCC × 0.5
LOCOCR.LCSTP
LOCO clock oscillator output
Figure 2.26 LOCO clock oscillation start timing
t_LOCO
HOCOCR.HCSTP
HOCO clock
Note 1. x = 24, 32, 48, 64
t_HOCOx*1
Figure 2.27 HOCO clock oscillation start timing (started by setting the HOCOCR.HCSTP bit)
SOSCCR.SOSTP
Sub-clock oscillator output
Figure 2.28 Sub-clock oscillation start timing
t_SUBOSC
R01DS0309EU0100 Rev.1.00
Mar 10, 2017
Page 52 of 107