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參數(shù)資料
| 型號： | EM78P447SAS |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-BIT MICRO-CONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 27/55頁 |
| 文件大?。?/td> | 1730K |
| 代理商： | EM78P447SAS |
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EM78P447S
OTP ROM
4.8 CODE Option Register
The EM78P447S has one CODE option word that is not a part of the normal program memory. The option bits cannot
be accessed during normal program execution.
Bit12
MS
Bit11
/ENWDT
Bit10
CLK
Bit9
CS
Bit8
HLP
Bit7
HLP
Bit6
TYPE
Bit5
-
Bit4
-
Bit3 Bit2 Bit1
-
-
Bit0
-
-
Bit 12 (MS
):Oscillator type selection.
0: RC type
1: XTAL type(XTAL1 and XTAL2)
Bit 11 (/ENWDT)
: Watchdog timer enable bit.
0: Enable
1: Disable
Bit 10 (CLK)
: Instruction period option bit.
0: two oscillator periods.
1: four oscillator periods.
Refer to the section on Instruction Set.
Bit 9 (CS)
: Code Security Bit
0: Security On
1: Security Off
Bit 8 (HLF)
: XTAL frequency selection
0: XTAL2 type (low frequency, 32.768KHz)
1: XTAL1 type (high frequency)
This bit will affect system oscillation only when Bit12(MS) is “1”. When MS is”0”, HLF must be “0”.
<Note>: The transient point of system frequency between HXT and LXY is around 400 KHz.
Bit 7 (HLP)
: Power selection.
0: Low power
1: High power
Bit 6(TYPE)
: Type selection for EM78P447SA or B.
0: EM78P447SB
1: EM78P447SA
Bit 5 and Bit4
: Reserved.
The bit5 set to “1” all the time.
The bit4 set to “0” all the time.
Bit 3~0
: Customer’s ID code
This specification is subject to change without prior notice.
06.25.2003 (V1.1)
27
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