EM78P153EN EMC [ELAN Microelectronics Corp], EM78P153EN Datasheet - Page 27

• Manufacturer Part Number: EM78P153EN
• Description: EM78P153E is an 8-bit microprocessor with low-power and high-speed CMOS technology
• Manufacturer: EMC [ELAN Microelectronics Corp]

This specification is subject to change without prior notice.
4.8 CODE Option Register
4. Internal RC Oscillator Mode
The EM78P153E has one CODE option word that is not a part of the normal program memory. The
option bits cannot be accessed during normal program execution.
Code Option Register and Customer ID Register arrangement distribution:
Table 9 RC Oscillator Frequencies
Table 10 Calibration Selection for Internal RC Mode
<Note>
EM78P153E offers a versatile internal RC mode with default frequency value of 4MHz. Internal RC
oscillator mode has other frequencies (1MHz, and 455KHz) that can be set by OPTION bits, RCM1
and RCM0. All these four main frequencies can be calibrated by programming the OPTION bits,
CAL0~CAL2. Table 10 describes a typical instance of the calibration.
*:Theoretical values, for reference only. It depend on process.
C2
1
1
0
0
1
1
0
0
100 pF
300 pF
20 pF
Cext
1. Measured on DIP packages.
2. Design reference only.
C1
0
0
0
0
1
1
1
1
C0
1
0
1
0
1
0
1
0
100k
100k
100k
Rext
3.3k
5.1k
3.3k
5.1k
3.3k
5.1k
10k
10k
10k
*Cycle Time (ns)
200.4
211.9
223.7
236.4
250.0
264.6
279.3
295.0
Average Fosc 5V,25 C
27
3.92 MHz
2.67 MHz
20.9 KHz
150 KHz
940 KHz
476 KHz
595 KHz
400 KHz
200 KHz
1.4 MHz
*Frequency (MHz)
1.4MHz
50KHz
4.99
4.72
4.47
4.23
4.00
3.78
3.58
3.39
Average Fosc 3V,25 C
EM78P153E
3.63 MHz
1.33 MHz
156 KHz
917 KHz
480 KHz
570 KHz
384 KHz
203 KHz
2.6 MHz
1.4 MHz
52 KHz
20 KHz
OTP ROM
2002/03/01