R5F10RF8AFP datasheet(21/76 Pages) RENESAS

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RL78/L12

2. ELECTRICAL SPECIFICATIONS (TARGET)

Page 21 of 73

R01DS0157EJ0001 Rev.0.01

2012.02.20

Under development

Preliminary document

Specifications in this document are tentative and subject to change.

Caution

The pins mounted depend on the product.

Refer to 1.3.1

32-pin products to 1.3.5

64-pin

products.

2.2 Oscillator Characteristics

2.2.1 Main system clock oscillator characteristics

(TA =

−40 to +85°C, 1.6 V ≤ EVDD = VDD ≤ 5.5 V, VSS = EVSS = 0 V)

Resonator

Recommended

Circuit

Parameter

Conditions

MIN.

TYP.

MAX.

Unit

2.7 V

≤ VDD ≤ 5.5 V

1.0

20.0

MHz

1.8 V

≤ VDD < 2.7 V

1.0

8.0

MHz

Ceramic resonator

VSS

X1 clock oscillation

frequency (fX)

Note

1.6 V

≤ VDD <1.8 V

1.0

4.0

MHz

2.7 V

≤ VDD ≤ 5.5 V

1.0

20.0

MHz

1.8 V

≤ VDD < 2.7 V

1.0

8.0

MHz

Crystal resonator

VSS

X1 clock oscillation

frequency (fX)

Note

1.6 V

≤ VDD <1.8 V

1.0

4.0

MHz

Note Indicates only oscillator characteristics.

Refer to AC Characteristics for instruction execution time.

Cautions 1. When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the

above figures to avoid an adverse effect from wiring capacitance.

• Keep the wiring length as short as possible.

• Do not cross the wiring with the other signal lines.

• Do not route the wiring near a signal line through which a high fluctuating current flows.

• Always make the ground point of the oscillator capacitor the same potential as VSS.

• Do not ground the capacitor to a ground pattern through which a high current flows.

• Do not fetch signals from the oscillator.

2. Since the CPU is started by the high-speed on-chip oscillator clock after a reset release,

check the X1 clock oscillation stabilization time using the oscillation stabilization time

counter status register (OSTC) by the user. Determine the oscillation stabilization time of the

OSTC register and the oscillation stabilization time select register (OSTS) after sufficiently

evaluating the oscillation stabilization time with the resonator to be used.

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