參數(shù)資料
型號(hào): W78E858
廠(chǎng)商: WINBOND ELECTRONICS CORP
元件分類(lèi): 微控制器/微處理器
英文描述: 8 BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
封裝: DIP-40
文件頁(yè)數(shù): 20/33頁(yè)
文件大小: 1186K
代理商: W78E858
W78E858
- 20 -
6.17 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.
6.17.1 F04KBOOT Mode
RST
P4.3
P2.7
P2.6
MODE
H
X
L
L
FO4KBOOT
H
L
X
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 Mode Timing
Ts=1us
Th > 24 clocks
P2.6
P2.7
X
X
RESET
6.18 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.
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