参数资料
型号: W78E858A40DL
厂商: Nuvoton Technology Corporation of America
文件页数: 15/35页
文件大小: 0K
描述: IC MCU 8-BIT 32K FLASH 40-DIP
标准包装: 10
系列: W78
核心处理器: 8052
芯体尺寸: 8-位
速度: 40MHz
连通性: EBI/EMI,串行端口
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 40-DIP
包装: 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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