RH850 datasheet(69/182 Pages) RENESAS

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Page 69 of 182

R01DS0494ED0100 Rev.1.00

June 16, 2025

RH850/U2A

Section 3 Electrical Characteristics

Note 1.

To reach internal usable clocks only following 4 frequencies are supported: 16MHz, 20MHz, 24MHz and

40MHz. Tolerance of external quartz crystal is assumed as +/–1%.

Note 2.

The StartUp is supported without external components under following conditions:

• See RH850/U2A-EVA Group User's Manual: Hardware

Section 51.12.16, OPBT10 — Option Byte 10

for default values of drivability, damping resistance and internal capacitance.

• Specification covers a maximum external stray capacitance of up to 6pF to each pin X1 and X2.

• After StartUp drivability and capacitance will be configured by OPBT10

• A possible exceeding of the recommended maximum drive level for a crystal for all start-up phases has to

be agreed with the crystal manufacturers separately.

Note 3.

Ccapsel_x1 (Ccapsel_x1 including parasitic capacitance to ground at the X1 side), Ccapsel_x2

(Ccapsel_x2 including parasitic capacitance to ground at the X2 side).

Note 4.

The capacitor tolerance is ±15%.

Note 5.

The clock source of SGMII used. Ethernet grade crystal is mandatory. Example: CX3225GA(KYOCERA)

Note 6.

12 kHz to 20 MHz rms jitter = 3 ps.

CAUTION

Oscillation stabilization times differ according to matching with the resonator. Secure

an oscillation stabilization time determined through evaluation of matching.

X1 clock Input high level pulse

width

tEXH

EXCLK mode

fEX = 16 MHz 26

fEX = 20 MHz 20

fEX = 24 MHz 16

fEX = 40 MHz 10

X1 clock rise time

tEXR

EXCLK mode

fEX = 16 MHz

fEX = 20 MHz

fEX = 24 MHz

fEX = 40 MHz

2.5

X1 clock fall time

tEXF

EXCLK mode

fEX = 16 MHz

fEX = 20 MHz

fEX = 24 MHz

fEX = 40 MHz

2.5

X1 clock Input total jitter

(Dj + 14 * rms Random jitter)

tCITJ

The clock source of SGMII used

@ 20MHz

73*6

ps peak

to peak

X1 Input capacitance

CX1

Main OSC. EXCLK mode,

MOSC_CAP_SEL = 0010

Table 3.3

Main Oscillator Characteristics (3/3)

Item

Symbol

Condition

MIN.

TYP.

MAX.

Unit

Figure 3.1

Oscillator Circuit Diagram (Crystal with External Components)

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