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EM78P447NAM Datasheet(PDF) 28 Page - ELAN Microelectronics Corp |
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EM78P447NAM Datasheet(HTML) 28 Page - ELAN Microelectronics Corp |
28 / 57 page ![]() EM78P447N OTP ROM 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. • 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: Type selection for EM78P447NA or EM78P447NB 0: EM78P447NB 1: EM78P447NA • 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. This specification is subject to change without prior notice. 10.21.2004 (V1.0) 28 |
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