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參數(shù)資料
| 型號(hào)： | W78E51C |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8 bit micocontroller |
| 中文描述： | 8位micocontroller |
| 文件頁數(shù)： | 11/23頁 |
| 文件大?。?/td> | 302K |
| 代理商： | W78E51C |
W78E51C
Publication Release Date: April 20, 2005
- 11 -
Revision A2
6.6 Reset
The external RESET signal is sampled at S5P2. To take effect, it must be held high for at least two
machine cycles while the oscillator is running. An internal trigger circuit in the reset line is used to
deglitch the reset line when the W78E51C is used with an external RC network. The reset logic also
has a special glitch removal circuit that ignores glitches on the reset line.
During reset, the ports are initialized to FFH, the stack pointer to 07H, PCON (with the exception of bit
4) to 00H, and all of the other SFR registers except SBUF to 00H. SBUF is not reset.
7. SECURITY BITS
During the programmer operation mode, the Flash EPROM can be programmed and verified
repeatedly. Until the code inside the Flash EPROM is confirmed OK, the code can be protected. The
protection of Flash EPROM and those operations on it are described below. The W78E51C has a
Special Setting Register, the Security Register, which can be accessed in normal mode. The register
can only be accessed from the Flash EPROM operation mode. Those bits of the Security Registers
can not be changed once they have been programmed from high to low. They can only be reset
through erase-all operation. The Security Register is addressed in the Flash EPROM operation mode
by address #0FFFFh.
B0
B1
B0 : Lock bit, logic 0 : active
B1 : MOVC inhibit,
logic 0 : the MOVC instruction in external memory
cannot access the code in internal memory.
logic 1 : no restriction.
B2 : Encryption
logic 0 : the encryption logic enable
logic 1 : the encryption logic disable
Default 1 for all security bits.
Special Setting Register
D7 D6 D5 D4 D3 D2 D1 D0
Security Bits
4KB Flash EPROM
Program Memory
Reserved
Security Register
0FFFFh
0000h
0FFFh
Reserved
B2
Reserved bits must be kept in logic 1.
B7
B7 : Osillator Control
logic 0 : 1/2 gain
logic 1 : Full gain
7.1 Lock Bit
This bit is used to protect the customer's program code in the W78E51C. It may be set after the
programmer finishes the programming and verifies sequence. Once this bit is set to logic 0, both the
on-chip ROM data and Special Setting Registers can not be accessed again.
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| W78E51 | 8-BIT MTP Monitor Microcontroller(多次可編程的8位的監(jiān)視微控制器) |
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| W78E516BP-24 | 8-BIT MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78E51C_06 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78E51P-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E51P-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E51P-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E51P-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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