Code Option Register - Elan EM78P156N Manual

Table 11 RC Oscillator Frequencies
Cext
20 pF
100 pF
300 pF
<Note> 1. Measured on DIP packages.
2. For design reference only.
3. The frequency drift is about ¡ Ó 30%

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:
This specification is subject to change without prior notice.
OSCI
EM78P156N
Fig. 13 Circuit for External RC Oscillator Mode
Rext
Average Fosc 5V,25°C Average Fosc 3V,25°C
3.3k
5.1k
10k
100k
3.3k
5.1k
10k
100k
3.3k
5.1k
10k
100k
29
Vcc
Rext
Cext
3.92 MHz 3.65 MHz
2.67 MHz 2.60 MHz
1.39MHz 1.40 MHz
149 KHz 156 KHz
1.39 MHz 1.33 MHz
940 KHz 920 KHz
480 KHz 475 KHz
52 KHz 50 KHz
595 KHz 560 KHz
400 KHz 390 KHz
200 KHz 200 KHz
21 KHz 20 KHz
EM78P156N
OTP ROM
07.29.2004 (V1.2)