参数资料
型号: W78E858A40DL
厂商: Nuvoton Technology Corporation of America
文件页数: 2/35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
Publication Release Date: April 22, 2008
- 10 -
Revision A8
jb
acc.7,$wait0
ret
;----------------------------------------------------------------
write_eeprom_block:
;input r0:counter
;input r1:pattern form
;input dptr:eeprom base address
$write_loop:
mov
a,r1
movx
@dptr,a
inc
dpl
djnz
r0,$write_loop
call
busy_waiting
ret
;----------------------------------------------------------------
read_eeprom_block:
;input r0:counter
;input r1:pattern form
;input dptr:eeprom base address
;output setb c --> fail
push
b
$read_loop:
movx
a,@dptr
mov
b,a
mov
a,r1
cjne
a,b,$error
inc
dpl
djnz
r0,$read_loop
clr
c
jmp
$end
$error:
setb
c
$end:
pop
b
ret
.end
5.4 On-chip Flash EPROM
The W78E858 includes two banks of FLASH EPROM. One is 32K bytes of main FLASH EPROM for
application program (APROM) and another 4K bytes of FLASH EPROM for loader program (LDROM)
when operating the in-system programming feature. In normal operation, the micro-controller will
execute the code from the 32K bytes of APROM. By setting program registers, user can force CPU to
switch to the programming mode which will execute the code (loader program) from the 4K bytes of
auxiliary LDROM, and this loader program is going to update the contents of the 32K bytes of
APROM. After chip reset, the micro-controller executes the new application program in the APROM.
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
end-user is able to easily update the system firmware by themselves without opening the
chassis.
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