Code Option Register - IBM EM78P809N Specification

EM78P809N
8-Bit Microcontroller
Table13. RC Oscillator Frequencies
Cext
20 pF
100 pF
300 pF
Note: 1. Measured on DIP packages.
2. For design reference only.

4.17 Code Option Register

The EM78P809N has one CODE option word that is not 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:
Bit 12~Bit 0
4.17.1 Code Option Register (Word 0)
Bit 12 ~ 9
Bit 12 ~ 9 : Not used
Bit 8 (CLKS) : Instruction period option bit.
Refer to the Instruction Set section.
Bit 7 (ENWDTB) : Watchdog timer enable bit.
58 •
Rext
3.3k
5.1k
10k
100k
3.3k
5.1k
10k
100k
3.3k
5.1k
10k
100k
Word 0
Bit 8 Bit 7
CLKS ENWDTB
CLKS = "0" : two oscillator periods.
CLKS = "1" : four oscillator periods.
ENWDTB = "0" : Enable
ENWDTB = "1" : Disable
Average Fosc 5V, 25 ° C Average Fosc 3V, 25 ° C
4.32 MHz
2.83 MHz
1.62 MHz
184kHz
1.39 MHz
950kHz
500kHz
54kHz
580kHz
390kHz
200kHz
21kHz
Word 1
Bit 12~Bit 0
Word 0
Bit 6 Bit 5 Bit 4
CYES - OSC
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
3.56 MHz
2.8 MHz
1.57 MHz
187kHz
1.35 MHz
930kHz
490kHz
55kHz
550kHz
380kHz
200kHz
21kHz
Word 2
Bit 12~Bit 0
Bit 3 Bit 2 Bit 1 Bit 0
HLP PR2 PR1 PR0