em78p156n ELAN Microelectronics Corp, em78p156n Datasheet - Page 29

• Manufacturer Part Number: em78p156n
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

This specification is subject to change without prior notice.
4.8 CODE Option Register
The EM78P156N has a 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 11 RC Oscillator Frequencies
<Note> 1. Measured on DIP packages.
100 pF
300 pF
20 pF
Cext
2. For design reference only.
3. The frequency drift is about ¡ Ó30%
Fig. 13 Circuit for External RC Oscillator Mode
100k
100k
100k
Rext
3.3k
5.1k
3.3k
5.1k
3.3k
5.1k
10k
10k
10k
EM78P156N
29
OSCI
Average Fosc 5V,25 C Average Fosc 3V,25 C
3.92 MHz
2.67 MHz
1.39 MHz
1.39MHz
149 KHz
940 KHz
480 KHz
595 KHz
400 KHz
200 KHz
52 KHz
21 KHz
Cext
Vcc
Rext
3.65 MHz
2.60 MHz
1.40 MHz
1.33 MHz
156 KHz
920 KHz
475 KHz
560 KHz
390 KHz
200 KHz
50 KHz
20 KHz
EM78P156N
OTP ROM
07.29.2004 (V1.2)