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EM78P447N
8-Bit Microcontroller with OTP ROM
26 •
Product Specification (V1.1) 03.30.2005
(This specification is subject to change without further notice)
Table 13 RC Oscillator Frequencies
Cext Rext
Average Fosc 5V,25°C Average Fosc 3V,25°C
3.3k 4.32 MHz 3.56 MHz
5.1k 2.83 MHz 2.8 MHz
10k 1.62MHz 1.57 MHz
20 pF
100k 184 KHz 187 KHz
3.3k 1.39 MHz 1.35 MHz
5.1k 950 KHz 930 KHz
10k 500 KHz 490 KHz
100 pF
100k 54KHz 55 KHz
3.3k 580 KHz 550 KHz
5.1k 390 KHz 380 KHz
10k 200 KHz 200 KHz
300 pF
100k 21 KHz 21 KHz
NOTE
1. Measured on DIP packages.
2. For design reference only.
4.8 CODE Option Register
The EM78P447N 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:
Word 0 Word 1
Bit12~Bit0 Bit12~Bit0
4.8.1 Code Option Register (Word 0)
Word 0
Bit12 Bit11 Bit10 Bit9 Bit8 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
- - EC - CLKS ENWDTB TYPE HLF OSC HLP PR2 PR1 PR0
Bit 12 11 : Not used.
Reserved.
The bit set to “1” all the time.
Bit 10 (EC): Error recovery Bit.
0: Enable
1: Disable
Bit 9: Not used.
Reserved.
The bit set to “0” all the time.