em78p164n ELAN Microelectronics Corp, em78p164n Datasheet - Page 49

• Manufacturer Part Number: em78p164n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.4) 05.28.2010
(This specification is subject to change without further notice)
The RC Oscillator frequencies:
Note:
5.10.4 Internal RC Oscillator Mode
The EM78P164N offers a versatile internal RC mode with default frequency value of 4 MHz.
Internal RC oscillator mode has other frequencies (16 MHz, 8 MHz, and 455kHz) that can be
set by Code Option (Word 1), RCM1, and RCM0. The Table below describes the
EM78P164N internal RC drift with voltage, temperature, and process variations.
Internal RC Drift Rate (Ta=25°C, VDD=5V±5%, VSS=0V)
Note : These are theoretical values which are provided for reference only. Actual values may
5.11 Power-on Considerations
Any microcontroller is not warranted to start operating properly before the power supply
has stabilized to a steady state. The EM78P164N has a built-in Power-on Reset (POR)
with reset level range of 1.7V to 1.9V. The circuitry eliminates the extra external reset
circuit. It will work well if Vdd rises quickly enough (50ms or less). However, under
critical applications, extra devices are still required to assist in solving power-on
problems.
RC Frequency
100 Pf
300 Pf
Internal
16 MHz
455kHz
20 Pf
Cext
8 MHz
4 MHz
2
3
1
vary depending on the actual process.
:
:
:
The values are for design reference only.
The frequency drift is ± 30%
Measured based on DIP packages.
(-40°C ~+85°C)
Temperature
Rext
100k
100k
100k
3.3k
5.1k
3.3k
5.1k
3.3k
5.1k
10k
10k
10k
±6%
±5%
±5%
±5%
Average Fosc 5V, 25 ° C
(2.3V~5.5V)
1.27 MHz
1.21 MHz
Voltage
3.5 MHz
2.4 MHz
140kHz
805kHz
420kHz
550kHz
364kHz
188kHz
45kHz
20kHz
±5%
±5%
±5%
±5%
Drift Rate
8-Bit Microcontroller with OTP ROM
Process
±3%
±3%
±3%
±3%
Average Fosc 3V, 25 ° C
1.24 MHz
1.18 MHz
3.0 MHz
2.2 MHz
143kHz
790kHz
418kHz
526kHz
350kHz
185kHz
46kHz
20kHz
EM78P164N
±14%
±13%
±13%
±13%
Total
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