Renesas RX Series, User Manual

Page: 1769 / 1823

R01UH0823EJ0100 Rev.1.00 Page 1769 of 1823
Jul 31, 2019
RX23W Group 51. Electrical Characteristics
Note 1. Time until the clock can be used after the main clock oscillator stop bit (MOSCCR.MOSTP) is set to 0 (operating).
Note 2. Reference values when an 8-MHz resonator is used.
When specifying the main clock oscillator stabilization time, set the MOSCWTCR register with a stabilization time value that is
equal to or greater than the resonator-manufacturer-recommended value.
After the MOSCCR.MOSTP bit is changed to enable the main clock oscillator, confirm that the OSCOVFSR.MOOVF flag has
become 1, and then start using the main clock.
Note 3. The VCC range should be 2.4 to 3.6 V when the PLL is used.
Note 4. Reference values when a 32.768-kHz resonator is used.
After the setting of the SOSCCR.SOSTP bit or RCR3.RTCEN bit is changed to operate the sub-clock oscillator, only start using
the sub-clock after the sub-clock oscillation stabilization wait time that is equal to or greater than the oscillator-manufacturer-
recommended value has elapsed.
Note 5. The VCC range should be 3.0 to 3.6 V when the USBPLL is used.
Note 6. The input frequency can be set to 6 or 8 MHz and the oscillation frequency can be set to 48 MHz only.
Note 7. Only 32.768 kHz can be used.
Table 51.24 Clock Timing
Conditions: 1.8 V ≤ VCC = VCC_USB = AVCC0 = VCC_RF = AVCC_RF ≤ 3.6 V, VSS = AVSS0= VSS_USB = VSS_RF = 0 V,
T
a
= –40 to +85°C
Item Symbol Min. Typ. Max. Unit Test Conditions
EXTAL external clock input cycle time t
Xcyc
50 — — ns Figure 51.19
EXTAL external clock input high pulse width t
XH
20 — — ns
EXTAL external clock input low pulse width t
XL
20 — — ns
EXTAL external clock rise time t
Xr
— — 5 ns
EXTAL external clock fall time t
Xf
— — 5 ns
EXTAL external clock input wait time
*
1 t
XWT
0.5 — — μs
Main clock oscillator oscillation
frequency
*
2
2.4 ≤ VCC ≤ 3.6 f
MAIN
1 — 20 MHz
1.8 ≤ VCC < 2.4 1 — 8
Main clock oscillation stabilization time (crystal)
*
2 t
MAINOSC
— 3 — ms Figure 51.20
Main clock oscillation stabilization time (ceramic
resonator)
* 2
t
MAINOSC
— 50 — μs
LOCO clock oscillation frequency f
LOCO
3.44 4.0 4.56 MHz
LOCO clock oscillation stabilization time t
LOCO
— — 0.5 μs Figure 51.21
IWDT-dedicated clock oscillation frequency f
ILOCO
12.75 15 17.25 kHz
IWDT-dedicated clock oscillation stabilization time t
ILOCO
— — 50 μs Figure 51.22
Bluetooth-dedicated clock oscillation frequency f
BLECK
— 32 — MHz
Bluetooth-dedicated low-speed on-chip oscillator
oscillation frequency f
BLELOCO
— 32.768 — kHz
HOCO clock oscillation frequency f
HOCO
(32 MHz)
31.36 32 32.64 MHz T
a
= 0 to +85°C
31.04 32 32.96 T
a
= –40 to +85°C
f
HOCO
(54 MHz)
52.96 54 55.08 MHz T
a
= 0 to +85°C
52.38 54 55.62 T
a
= –40 to +85°C
HOCO clock oscillation stabilization time t
HOCO
— — 30 μs Figure 51.24
PLL input frequency *
3
f
PLLIN
4 — 12.5 MHz
PLL circuit oscillation frequency *
3 f
PLL
24 — 54 MHz
PLL clock oscillation stabilization time t
PLL
— — 50 μs Figure 51.25
PLL free-running oscillation frequency f
PLLFR
— 8 — MHz
USBPLL input frequency
*
5 f
PLLIN
— 6, 8*
6
— MHz
USBPLL circuit oscillation frequency
*
5 f
PLL
— 48*
6
— MHz
USBPLL clock oscillation stabilization time t
PLL
— — 50 μs Figure 51.25
Sub-clock oscillator oscillation frequency
*
7 f
SUB
— 32.768 — kHz
Sub-clock oscillation stabilization time * 4 t
SUBOSC
— 0.5 — s Figure 51.26