EM78P152S datasheet(29/52 Pages) ETC1

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EM78P152/3S

8-Bit Microcontroller with OTP ROM

Product Specification (V1.8) 09.08.2009

• 25

(This specification is subject to change without further notice)

Table 5-7

RC Oscillator Frequencies

Cext

Rext

Average Fosc

5V, 25

°C

Average Fosc

3V, 25

°C

3.3k

3.92 MHz

3.65 MHz

5.1k

2.67 MHz

2.60 MHz

10k

1.4 MHz

1.40 MHz

20pF

100k

150kHz

156kHz

3.3k

1.4 MHz

1.33 MHz

5.1k

940kHz

917kHz

10k

476kHz

480kHz

100pF

100k

50kHz

52kHz

3.3k

595kHz

570kHz

5.1k

400kHz

384kHz

10k

200kHz

203kHz

300pF

100k

20.9kHz

20kHz

Note:

1: Measured based on DIP packages.

2: The values are for design reference only.

3: The frequency drift is ± 30%.

5.7.4 Internal RC Oscillator Mode

EM78P152/3S offers a versatile internal RC mode with default frequency value of

4MHz. The Internal RC oscillator mode has other frequencies (1MHz, 8MHz, &

455kHz) that can be set by Code Option (Word 1), RCM1, and RCM0. All these four

main frequencies can be calibrated by programming the Option Bits CAL0 ~ CAL2.

The table below describes the EM78P152/3S internal RC drift with variation of voltage,

temperature, and process.

Table 5-8 Internal RC Drift Rate (Ta=25°C, VDD=5V±5%, VSS=0V)

Drift Rate

Internal RC

Temperature

°C~70°C)

Voltage

(2.3V~5.5V)

Process

Total

8 MHz

± 3%

± 5%

± 10%

± 18%

4 MHz

± 3%

± 5%

± 13%

1 MHz

± 3%

± 5%

± 10%

± 18%

455kHz

± 3%

± 5%

± 10%

± 18%

Note:

These are theoretical values provided for reference only. Actual values may vary

depending on the actual process.

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