EM78F651NAMSSLASHNAMJ datasheet(42/58 Pages) EMC

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EM78F651N

8-Bit Microcontroller

•

Product Specification (V1.1) 10.20.2006

(This specification is subject to change without further notice)

Table 14 RC Oscillator Frequencies

Cext

Rext

Average Fosc 5V, 25

°C

Average Fosc 3V, 25

°C

3.3k

3.3 MHz

3 MHz

5.1k

2.27 MHz

2.1 MHz

10k

1.1 MHz

1.05 MHz

20 pF

100k

145kHz

3.3k

1.02 MHz

0.98 MHz

5.1k

724kHz

694kHz

10k

360kHz

100 pF

100k

45kHz

47kHz

3.3k

400kHz

380kHz

5.1k

280kHz

270kHz

10k

143kHz

140kHz

300 pF

100k

14kHz

Note:

1: Measured based on DIP packages.

2: The values are for design reference only.

6.9.4 Internal RC Oscillator Mode

EM78F651N offers a versatile internal RC mode with default frequency value of

4MHz. Internal RC oscillator mode has other frequencies (1MHz, 8MHz and 455kHz)

that can be set by Code Option (Word 1), RCM1 and RCM0. All these four main

frequencies can be calibrated by programming the Code Option (Word 1) bits,

C4~C0. Table 15 describes a typical instance of the calibration.

Table 15 Internal RC Drift Rate (Ta=25

°C, VDD=5 V± 5%, VSS=0V)

Drift Rate

Internal RC

Temperature

(-40

°C~85°C)

Voltage

(2.3V~5.5V)

Process

Total

4MHz

± 3%

± 5%

± 3%

± 11%

16MHz

± 3%

± 5%

± 13%

3.58MHz

± 3%

± 5%

± 13%

455kHz

± 3%

± 5%

± 13%

Table 16 Calibration Selections for Internal RC Mode

*Cycle Time (ns)

*Frequency (MHz)

399

2.506

385

2.6

371

2.693

358

2.786

347

2.879

336

2.973

326

3.066

316

3.159

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