ELAN Home Systems EM78P458 - Manual (Page 51)

EM78P458/459
OTP ROM
EM78P458
EM78P459
/RESET
VDD
100K
Q1
1N4684
10K
33K
VDD
Fig. 25 Circuit 1 for the Residue Voltage Protection
EM78P458
EM78P459
/RESET
VDD
Q1
VDD
R3 R2
R1
Fig. 26 Circuit 2 for the Residue Voltage Protection
4.14 CODE OPTION
EM78P458/459 has one CODE option word and one Customer ID word that are not a part of the
normal program memory.
Word 0 Word 1
Bit12~Bit0 Bit12~Bit0
Code option12~0 Code option12~0
1. Code Option Register (Word 0)
Bit12 Bit11 Bit10 Bit9 Bit8 Bit7 Bit6 Bit5~Bit0
MS /ENWDT CLKS /PTB HLF RCT HLP ID
• Bit 12 (MS): Oscillator type selection.
0: RC type
This specification is subject to change without prior notice. 07.01.2003 (V1.3) 51