RX634 datasheet(68/106 Pages) RENESAS

Part #	RX634

Description	54 MHz 32-bit RX MCU with FPU, 90 DMIPS, up to 2-Mbyte flash memory

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Manufacturer	RENESAS [Renesas Technology Corp]

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R01DS0255EJ0100 Rev.1.00

Page 68 of 106

Feb 25, 2015

RX634 Group

5. Electrical Characteristics

Note 1. The values in parentheses indicate when the MONFCR register is set to a value other than A5h (noise filter enabled) while

CECMCLK is selected as the CEC operating clock and RCRMCLK is selected as the RCR operating clock.

Note 2. Time until the clock can be used after the main clock oscillator stop bit (MOSCCR.MOSTP) is set to 0 (operating).

Note 3. When using a main clock, request the oscillator manufacturer to evaluate the oscillator. For the oscillation stabilization time,

refer to the evaluation results obtained from the oscillator manufacturer.

Note 4. The number of cycles n selected by the value of the MOSCWTCR.MSTS[4:0] bits determines the main-clock oscillation

stabilization waiting time in accord with the formula below.

Note 5. The number of cycles n selected by the value of the PLLWTCR.PSTS[4:0] bits determines the PLL-clock oscillation stabilization

waiting time in accord with the formula below.

Figure 5.1

BCLK Pin Output Timing

Figure 5.2

EXTAL External Clock Input Timing

Figure 5.3

Main Clock Oscillation Start Timing

tMAINOSCWT = tMAINOSC +

n +16384

fMAIN

tPLLWT1 = tPLL1 +

n +131072

fPLL

tPLLWT2 = tPLL2 +

= tMAINOSC + tPLL1 +

n +131072

fPLL

n +131072

fPLL

tCf

tCH

tBcyc

tCr

tCL

BCLK pin output

Test conditions: VOH = VCC × 0.7, VOL = VCC × 0.3, IOH = 1.0 mA, IOL = 1.0 mA, C = 30 pF

tEXH

tEXcyc

EXTAL external clock input

VCC × 0.5

tEXL

tEXr

tEXf

Main clock oscillator output

MOSCCR.MOSTP

tMAINOSC

Main clock

tMAINOSCWT

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