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EM78P447NAM Datasheet(PDF) 29 Page - ELAN Microelectronics Corp

Part # EM78P447NAM
Description  8-BIT MICRO-CONTROLLER
Download  57 Pages
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 29 Page - ELAN Microelectronics Corp

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EM78P447N
OTP ROM
• 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
0
1
1
Enable
1
0
0
Enable
1
0
1
Enable
1
1
0
Enable
1
1
1
Disable
2. Customer ID Register (Word 1)
Word 1
Bit 12~Bit 0
XXXXXXXXXXXXX
• Bit 12~0: Customer’s ID code
4.9 Power On Considerations
Any microcontroller is not guaranteed to start and operate properly before the power supply stays at its
steady state. EM78P447N is equipped with Power On Voltage Detector(POVD) with a detecting level is
2.0V. It will work well if Vdd rises fast enough (10 ms or less). In many critical applications, however,
extra devices are still required to assist in solving power-up problems.
This specification is subject to change without prior notice.
10.21.2004 (V1.0)
29


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