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參數(shù)資料
| 型號(hào)： | W79E227AFG |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 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, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-48 |
| 文件頁(yè)數(shù)： | 13/200頁(yè) |
| 文件大小： | 3644K |
| 代理商： | W79E227AFG |
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Preliminary W79E225A/227A Data Sheet
Publication Release Date: December 14, 2007
- 13 -
Revision A2.0
6. MEMORY ORGANIZATION
The W79E225/227 separates the memory into two sections; Program Memory and Data Memory.
Program Memory stores instruction op-codes, while Data Memory stores data or memory-mapped
devices.
6.1 Program Memory (on-chip Flash)
W79E225/227 includes one
16/64
K bytes of main FLASH EPROM for application program (AP FLASH
EPROM) and one 4K bytes of FLASH EPROM for loader program (LD FLASH EPROM) to operate the
in-system programming (ISP) feature, and one
1/2
K bytes of NVM Flash EPROM for data storage.
The
16/64
K bytes Flash EPROM is AP0 bank. The default active bank is AP0.
In normal operation, the microcontroller will execute the code from main FLASH EPROM. By setting
program registers, user can force the microcontroller to switch to programming mode which will cause
it to execute the code (loader program) from the 4K bytes of auxiliary LD FLASH EPROM to update
the contents of the
16/64
K bytes of main FLASH EPROM. After reset, the microcontroller will executes
the new application program in the main FLASH EPROM. This ISP feature makes the job easy and
efficient in which the application needs to update firmware frequently without opening the chassis.
6.2 Data Memory
W79E225/227 can access up to 64Kbytes of external Data Memory. This memory region is accessed
by the MOVX instructions. Unlike the 8051 derivatives, W79E225/227 contains on-chip
1/2
Kbytes of
Data Memory, which only can be accessed by MOVX instructions. These
1/2
Kbytes of SRAM is
between address 0000h and
03FFH/07FFH
. Access to the on-chip Data Memory is optional under
software control. When enabled by DMEO bit of PMR register, a MOVX instruction that uses this area
will go to the on-chip RAM. If MOVX instruction accesses the addresses greater than
03FFH/07FFH
CPU will automatically access external memory through Port 0 and 2. When disabled, the
1/2
KB
memory area is transparent to the system memory map. Any MOVX directed to the space between
0000h and FFFFH goes to the expanded bus on the Port 0 and 2. This is the default condition. In
addition, the device has the standard 256 bytes of on-chip RAM. This can be accessed either by direct
addressing or by indirect addressing. There are also some Special Function Registers (SFRs), which
can only be accessed by direct addressing.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W79E227APG | 8-BIT MICROCONTROLLER |
| W79E532 | 8-BIT MICROCONTROLLER |
| W79E532A40DL | 8-BIT MICROCONTROLLER |
| W79E532A40DN | 8-BIT MICROCONTROLLER |
| W79E532A40FL | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W79E227ALG | 制造商:Nuvoton Technology Corp 功能描述:IC MCU 64K EPROM FLASH 48LQFP |
| W79E227APG | 制造商:Nuvoton Technology Corp 功能描述:IC MCU 64K EPROM FLASH 44PLCC |
| W79E342 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:W79E342 datasheet |
| W79E4051_2051 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:W79E4051_2051_SC7（中文） |
| W79E4051_W79E2051 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:W79E4051_W79E2051 |
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