參數(shù)資料
型號: W78E858A40FL
廠商: Nuvoton Technology Corporation of America
文件頁數(shù): 14/35頁
文件大?。?/td> 0K
描述: IC MCU 8-BIT 32K FLASH 44-PQFP
標(biāo)準(zhǔn)包裝: 96
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
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 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-BQFP
包裝: 托盤
W78E858
5.17 F04KBOOT Mode (Boot From 4K Bytes LDROM)
The W78E858 boots from APROM program (32K bytes bank) by default after chip reset. On some
occasions, user can force the W78E858 to boot from the LDROM program (4K bank) after chip reset.
The setting for this special mode is as follow.
5.17.1 F04KBOOT Mode
RST
P4.3
P2.7
P2.6
MODE
H
X
L
FO4KBOOT
H
L
X
FO4KBOOT
Note: In application system design, user must take care the P2, P3, ALE,
EA and PSEN pin status at reset to avoid
W78E858 entering the programming mode or F04KBOOT mode in normal operation.
Enter 4K Reboot M ode Tim ing
Ts=1us
Th > 24 clocks
P2.6
P2.7
X
RESET
5.18 Security
During the on-chip FLASH EPROM programming 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 W78E858 has several special setting registers in FLASH EPROM block. Those bits of the security
register can’t be changed once they have been programmed from high to low. They can only be reset
through erase-all operation. The security register is located at the FFFFH on the same bank with 4K
LDROM i.e., P3.6 must set high at writer mode.
Publication Release Date: April 22, 2008
- 21 -
Revision A8
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