em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 163

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
6.15.4 Internal RC Oscillator Mode
The EM78F64x/54xN series MUCs offer a versatile internal RC mode with default
frequency value of 4MHz. The internal RC oscillator mode has other frequencies
(4MHz, 16MHz, 8MHz, & 455kHz), that can be set by CODE OPTION: RCM1 and
RCM0. All these four main frequencies can be calibrated by programming the CODE
OPTION Bits C4~C0. The following table shows a typical drift rate of the calibration.
*
16 MHz Operating Temperature: -40
Internal RC
Internal RC
RC Oscillator Frequencies:
F644/544N Internal RC Drift Rate (Ta=25 ° C, VDD=5 V± 5%, VSS=0V):
F642/542N Internal RC Drift Rate (Ta=25°C, VDD=5 V± 5%, VSS=0V):
16 MHz
455kHz
16MHz
1. Data obtained from DIP packages measurement.
2. Data provided for design reference only.
4 MHz
8 MHz
1MHz
4MHz
8MHz
100 pF
300 pF
20 pF
Cext
*
Temperature
(-40°C~85°C)
Temperature
(-40°C~85°C)
Rext
100k
100k
100k
3.3k
5.1k
3.3k
5.1k
3.3k
5.1k
10k
10k
10k
± 3%
± 3%
± 3%
± 3%
± 5%
± 5%
± 5%
± 5%
Average Fosc 5V,25°C
EM78F648/644/642/641/548/544/542/541N
°
C ~ 50
(2.4V~5.5V)
(2.4V~5.5V)
1.30 MHz
1.27 MHz
140 KHz
850 KHz
450 KHz
560 KHz
370 KHz
196 KHz
3.5 MHz
2.5 MHz
Voltage
Voltage
48 KHz
20 KHz
± 4%
± 4%
± 5%
± 5%
± 5%
± 5%
± 5%
± 5%
NOTE
°
C
Drift Rate
Drift Rate
Process
Process
± 2.5%
± 2.5%
± 2.5%
± 2.5%
± 2.5%
± 2.5%
± 2.5%
± 2.5%
Average Fosc 3V,25°C
8-Bit Microcontroller
1.25 MHz
1.21 MHz
140 KHz
820 KHz
450 KHz
540 KHz
360 KHz
192 KHz
3.2 MHz
2.3 MHz
50 KHz
20 KHz
± 11.5%
± 11.5%
± 12.5%
± 12.5%
± 10.5%
± 10.5%
± 10.5%
± 10.5%
Total
Total
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