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EM78P156N
OTP ROM
Word 0 Word 1
Bit12~Bit0 Bit12~Bit0
1. Code Option Register (Word 0)
WORD 0
Bit12 Bit11 Bit10 Bit9 Bit8 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
- - - - CLKS ENWDTB - HLF OSC HLP PR2 PR1 PR0
• Bit 12 11 10 9:Not used.
Reserved.
The bit set to “1” all the time.
• Bit 8 (CLKS): Instruction period option bit.
0: two oscillator periods.
1: four oscillator periods.
Refer to the section on Instruction Set.
• Bit 7(ENWDTB): Watchdog timer enable bit.
0: Enable
1: Disable
• Bit 6: Not used.
Reserved.
The bit set to “1” all the time.
• Bit 5 (HLF): XTAL frequency selection
0: XTAL2 type (low frequency, 32.768KHz)
1: XTAL1 type (high frequency)
This bit will affect system oscillation only when Bit4 (OSC) is “1”. When OSC is”0”, HLF must be “0”.
<Note>: The transient point of system frequency between HXT and LXY is around 400 KHz.
• Bit 4 (OSC):Oscillator type selection.
0:RC type
1:XTAL type (XTAL1 and XTAL2)
• Bit 3 (HLP): Power selection.
0: Low power
1: High power
• Bit 2~0 (PR2~PR0): Protect Bit
PR2~PR0 are protect bits, protect type as following
PR2 PR1 PR0 Protect
0 0 0 Enable
0 0 1 Enable
0 1 0 Enable
This specification is subject to change without prior notice. 30 07.29.2004 (V1.2)
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