參數(shù)資料
型號: W78E365-24
英文描述: Microcontroller
中文描述: 微控制器
文件頁數(shù): 13/35頁
文件大?。?/td> 186K
代理商: W78E365-24
Preliminary W78E365
Publication Release Date: April 2001
- 13 -
Revision A1
ADDRESS BUS
Bit Length
Selectable
comparator
REGISTER
P4xAL
P4xAH
EQUAL
P4.x
MUX 4->1
WR_CS
P4 REGISTER
P4.x
READ
WRITE
DATA I/O
RD_CS
RD/WR_CS
REGISTER
P4xCMP1
P4xFUN0
P4xFUN1
P4xCSINV
P4.x INPUT DATA BUS
PIN
Port 4 Block Diagram
In-System Programming (ISP) Mode
The W78E365 equips one 64K byte of main FLASH EPROM bank for application program (called
APROM) and one 4K byte of auxiliary FLASH EPROM bank for loader program (called LDROM). In the
normal operation, the microcontroller executes the code in the APROM. If the content of APROM
needs to be modified, the W78E365 allows user to activate the In-System Programming (ISP) mode by
setting the CHPCON register.
The CHPCON is read-only by default,
software
must write two
specific values 87H, then 59H sequentially to the CHPENR register to enable the CHPCON write
attribute. Writing CHPENR register with the values except 87H and 59H will close CHPCON
register write attribute.
The W78E365 achieves all in-system programming operations including
enter/exit ISP Mode, program, erase, read ...etc, during device in the idle mode. Setting the bit
CHPCON.0 the device will enter in-system programming mode after a wake-up from idle mode.
Because device needs proper time to complete the ISP operations before awaken from idle mode,
software may use timer interrupt to control the duration for wake-up from idle mode. This in-system
programming feature makes the job easy and efficient in which the application needs to update
firmware frequently. In some applications, the in-system programming feature make it possible that
the end-user is able to easily update the system firmware by themselves without opening the chassis.
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