參數(shù)資料
型號(hào): W78E858A40PL
廠商: Nuvoton Technology Corporation of America
文件頁數(shù): 15/35頁
文件大?。?/td> 0K
描述: IC MCU 8-BIT 32K FLASH 44-PLCC
標(biāo)準(zhǔn)包裝: 30
系列: W78
核心處理器: 8052
芯體尺寸: 8-位
速度: 40MHz
連通性: EBI/EMI,串行端口
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 44-PLCC
包裝: 管件
W78E858
Security Register
4KB LDRO M
FFFFH
0000H
0FFEH
On-Chip
Reversed
5.18.1 Lock Bit (Bit0)
This bit is used to protect the customer's program code in the W78E858. It may be set after the
programmer finishes the programming and verifies sequence. Once these bits are set to logic 0, both
the FLASH EPROM data and all data in FLASH EPROM block can’t be accessed again.
5.18.2 MOVC Lock (Bit1)
When this bit is program to "0", the MOVC instruction will be disable when the program counter more
than 7FFFh or EA pin is forced low.
5.18.3 Scramble Enable (Bit2)
This bit is used to protect the customer's program code in the W78E858. If this bit is set to logic 0, the
dump ROM code are scrambled by a scramble circuit and the dump ROM code will become a random
ROM code.
5.18.4 Oscillator Gain Select (Bit7)
If this bit is set to logic 0 (for 24 MHz), the EMI effect will be reduce. If this bit is set to logic 1 (for 40
MHz), the W78E858 could to use 40 MHz crystal, but the EMI effect is major. So we provide the option
bit which could be chose by customer.
Publication Release Date: April 22, 2008
- 22 -
Revision A8
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