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RX24T Datasheet(PDF) 90 Page - Renesas Technology Corp |
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RX24T Datasheet(HTML) 90 Page - Renesas Technology Corp |
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90 / 133 page  R01DS0257EJ0200 Rev.2.00 Page 90 of 133 Apr 14, 2017 RX24T Group 5. 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) when the external clock is stable. 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 changing the setting of the MOSCCR.MOSTP bit so that the main clock oscillator operates, read the OSCOVFSR.MOOVF flag to confirm that is has become 1, and then start using the main clock. Figure 5.22 EXTAL External Clock Input Timing Table 5.16 Clock Timing Conditions: VCC = 2.7 V to 5.5 V, AVCC0 = AVCC1 = AVCC2 = VREF = VCC to 5.5 V, VSS = AVSS0 = AVSS1 = AVSS2 = 0 V, Ta = –40 to +85°C Item Symbol Min. Typ. Max. Unit Test Conditions EXTAL external clock input cycle time tXcyc 50 — — ns Figure 5.22 EXTAL external clock input high pulse width tXH 20 — — ns EXTAL external clock input low pulse width tXL 20 — — ns EXTAL external clock rise time tXr —— 5 ns EXTAL external clock fall time tXf —— 5 ns EXTAL external clock input wait time*1 tXWT 0.5 — — μs Main clock oscillator oscillation frequency fMAIN 1— 20 MHz Main clock oscillation stabilization time (crystal)*2 tMAINOSC — 3 — ms Figure 5.23 Main clock oscillation stabilization time (ceramic resonator)*2 tMAINOSC —50— μs LOCO clock oscillation frequency fLOCO 3.44 4.0 4.56 MHz LOCO clock oscillation stabilization time tLOCO — — 0.5 μs Figure 5.24 HOCO clock oscillation frequency fHOCO (32MHz) 31.52 32 32.48 MHz Ta = –40 to –20°C 31.68 32 32.32 MHz Ta = –20 to +75°C 31.52 32 32.48 MHz Ta = +75 to +85°C fHOCO (64MHz) 63.04 64 64.96 MHz Ta = –40 to –20°C 63.36 64 64.64 MHz Ta = –20 to +75°C 63.04 64 64.96 MHz Ta = +75 to +85°C HOCO clock oscillation stabilization time tHOCO (32MHz) — — 37.1 μs Figure 5.26 tHOCO (64MHz) — — 80.6 μs Figure 5.26 IWDT-dedicated clock oscillation frequency fILOCO 12.75 15 17.25 kHz IWDT-dedicated clock oscillation stabilization time tILOCO — — 50 μs Figure 5.27 PLL circuit oscillation frequency fPLL 40 — 80 MHz PLL clock oscillation stabilization time tPLL — — 50 μs Figure 5.28 PLL free-running oscillation frequency fPLLFR —8— MHz tXH tXcyc EXTAL external clock input VCC × 0.5 tXL tXr tXf |
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