S124 Datasheet, PDF(42/98 Page) Renesas Technology Corp – 32-bit ARM Cortex-M0+ microcontroller

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S124 Datasheet, PDF (42/98 Pages) Renesas Technology Corp – 32-bit ARM Cortex-M0+ microcontroller

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S124

2. Electrical Characteristics

Table 2.21 Clock timing (2/2)

Item

Symbol

Min

Typ

Max

Unit

Test conditions

Sub-clock oscillation stabilization time*2

tSUBOSC

0.5

Figure 2.21

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 so that the sub-clock oscillator operates, only start using

the sub-clock after the sub-clock oscillation stabilization wait time that is equal to or greater than the oscillator

manufacturerâs recommended value has elapsed.

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 Î¼s.

Note 6. Check OSCSF.HOCOSF to confirm whether stabilization time has elapsed.

XTAL external clock input

Figure 2.18

tXr

XTAL external clock input timing

tXcyc

tXH

tXL

tXf

VCC Ã 0.5

LOCOCR.LCSTP

LOCO clock oscillator output

Figure 2.19 LOCO clock oscillation start timing

tLOCO

HOCOCR.HCSTP

HOCO clock

Note 1. x = 24, 32, 48, 64

tHOCOx*1

Figure 2.20 HOCO clock oscillation start timing (started by setting the HOCOCR.HCSTP bit)

SOSCCR.SOSTP

Sub-clock oscillator output

tSUBOSC

Figure 2.21 Sub-clock oscillation start timing

R01DS0264EU0100 Rev.1.00

Feb 23, 2016

Page 42 of 95

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