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EM78P447NAM Datasheet(PDF) 28 Page - ELAN Microelectronics Corp

Part # EM78P447NAM
Description  8-BIT MICRO-CONTROLLER
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 28 Page - ELAN Microelectronics Corp

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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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