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EM78P341 Datasheet(PDF) 78 Page - ELAN Microelectronics Corp |
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EM78P341 Datasheet(HTML) 78 Page - ELAN Microelectronics Corp |
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78 / 102 page  EM78P341N/342N/343N 8-Bit Microprocessor with OTP ROM 72 • Product Specification (V1.0) 12.01.2006 (This specification is subject to change without further notice) Based on the above reasons, it must be kept in mind that all supply voltage, the operation temperature, the components of the RC oscillator, the package types, and the PCB layout have certain effects on the system frequency. The RC Oscillator frequencies : Cext Rext Average Fosc 5V, 25 °C Average Fosc 3V, 25 °C 3.3k 3.5 MHz 3.2 MHz 5.1k 2.5 MHz 2.3 MHz 10k 1.30 MHz 1.25 MHz 20 pF 100k 140 KHz 140kHz 3.3k 1.27 MHz 1.21 MHz 5.1k 850kHz 820kHz 10k 450kHz 450kHz 100 pF 100k 48kHz 50kHz 3.3k 560kHz 540kHz 5.1k 370kHz 360kHz 10k 196kHz 192kHz 300 pF 100k 20kHz 20kHz Note: 1: Measured based on DIP packages. 2: The values are for design reference only. 3: The frequency drift is ± 30% 6.11.4 Internal RC Oscillator Mode The EM78P341N/342N/343N 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. The Table below describes the EM78P341N/342N/343N internal RC drift with voltage, temperature, and process variations. Internal RC Drift Rate (Ta=25°C, VDD=5V±5%, VSS=0V) Drift Rate Internal RC Frequency Temperature (-40 °C ~+85°C) Voltage (2.3V~5.5V) Process Total 4MHz ±5% ±5% ±4% ±14% 16MHz ±5% ±5% ±4% ±14% 1MHz ±5% ±5% ±4% ±14% 455MHz ±5% ±5% ±4% ±14% Theoretical values are for reference only. Actual values may vary depending on the actual process. |
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