EM78159NAS EMC [ELAN Microelectronics Corp], EM78159NAS Datasheet - Page 33

• Manufacturer Part Number: EM78159NAS
• Description: 8-Bit Microcontroller with OTP ROM
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.0) 03.10.2006
(This specification is subject to change without further notice)
4.7.4 Internal RC Oscillator Mode
EM78P159N 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 (WORD1), RCM1, and RCM0. All these four main
frequencies can be calibrated by programming the OPTION Bits C3 ~ C0. The table
below describes a typical instance of the calibration.
RC Frequency
The above are theoretical values and are provided for reference only. Actual values
may vary depending on actual process.
455MHz
Internal
4MHz
8MHz
1MHz
RC Oscillator Frequencies
Internal RC Drift Rate (Ta=25℃, VDD=3.9V±5%, VSS=0V)
100 pF
300 pF
20 pF
Cext
(-40℃ ~ +85℃)
Temperature
±5%
±5%
±5%
±5%
1. Measured on DIP packages.
2. The values are for design reference only.
3. The frequency drift is about
Rext
100k
100k
100k
3.3k
5.1k
3.3k
5.1k
3.3k
5.1k
10k
10k
10k
(2.3V ~ 5.5V)
Voltage
NOTE
±5%
±5%
±5%
±5%
Drift Rate
Average Fosc
3.92 MHz
2.67 MHz
1.39 MHz
5V, 25°C
1.39MHz
149 kHz
940 kHz
480 kHz
595 kHz
400 kHz
200 kHz
52 kHz
21 kHz
8-Bit Microcontroller with OTP ROM
Process
±
30%
±4%
±4%
±4%
±4%
Average Fosc
3.65 MHz
2.60 MHz
1.40 MHz
1.33 MHz
3V, 25°C
156 kHz
920 kHz
475 kHz
560 kHz
390 kHz
200 kHz
50 kHz
20 kHz
±14%
±14%
±14%
±14%
Total
EM78P159N
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