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Sheet目录3882

131页 132页 133页 134页 [135页]136页 137页 138页 139页

LC88F83B0A

No.A1228-22/25

Characteristics of a Sample OSC1 System Clock Oscillation Circuit

Given below are the characteristics of a sample OSC1 system clock oscillation circuit that are measured using a Our

designated oscillation characteristics evaluation board and external components with circuit constant values with which

the oscillator vendor confirmed normal and stable oscillation.

Table 1 Characteristics of a Sample OSC1 System Clock Oscillator Circuit with a Ceramic Oscillator

Nominal

Frequency

Vendor

Name

Oscillator

Name

Circuit Constant

Operating

Voltage

Range

[V]

Oscillation

Stabilization Time

Remarks

[pF]

Rf1

[

Ω]

Rd1

[

Ω]

typ

[ms]

max

[ms]

4.194MHz

MURATA

CSTCR4M00G53-R0

(15)

OPEN

2.4 to 5.5

0.1

0.5

Internal C1,C2

CSTLS4M00G53-B0

(15)

OPEN

2.4 to 5.5

0.1

0.5

4.000MHz

MURATA

CSTCR4M00G53-R0

(15)

OPEN

2.4 to 5.5

0.1

0.5

Internal C1,C2

CSTLS4M00G53-B0

(15)

OPEN

2.4 to 5.5

0.1

0.5

The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after the

following reference timing points: (See Figure 4)

VDD goes above the operating voltage lower limit.

An instruction for starting the OSC1 clock oscillator circuit is executed.

Oscillation starts after the microcontroller exits the X'tal HOLD mode with the ENOSC1 bit (OCR0 register, bit 1)

set to 1.

Characteristics of a Sample OSC0 System Clock Oscillator Circuit

Given below are the characteristics of a sample OSC0 system clock oscillation circuit that are measured using a Our

designated oscillation characteristics evaluation board and external components with circuit constant values with which

the oscillator vendor confirmed normal and stable oscillation.

Table 2 Characteristics of a Sample OSC0 System Clock Oscillator Circuit with a CF Oscillator

Nominal

Frequency

Vendor Name

Oscillator Name

Circuit Constant

Operating

Voltage

Range

[V]

Oscillation

Stabilization Time

Remarks

[pF]

Rf2

[

Ω]

Rd2

[

Ω]

typ

[s]

max

[s]

32.768kHz

EPSON

TOYOCOM

MC-306

OPEN

390k

2.3 to 5.5

1.3

3.0

Applicable

CL value=12.5pF

SMD-type

The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after the

instruction for starting the OSC0 clock oscillation circuit is executed. (See Figure 4)

Note: The components that are involved in oscillation should be placed as close to the IC and to one another as possible

because they are vulnerable to the influences of the circuit pattern.

Figure 1 CF Oscillator Circuit

Figure 2 XT Oscillator Circuit

Figure 3 AC Timing Measurement Point

0.5VDD

CF2

CF1

Rd1

Rf1

Rd2

X’tal

XT2

XT1

Rf2

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