參數(shù)資料
型號: μSAP70732-B03
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 78/166頁
文件大?。?/td> 713K
代理商: ΜSAP70732-B03
78
μSAP705100-B03, μSAP70732-B03 USER'S MANUAL
2.3.4 MCU Buffer
The minimum unit in which JPEG processing can be performed is called an MCU (Minimum Coded Unit).
This library requires a buffer (MCU buffer) to store the image data (from intermediate image data to final
image data) when the image is compressed or expanded in this unit.
This MCU buffer is allocated to the last member of the CJINFO structure/DJINFO structure for the AP70732-
B03. With the AP705100-B03, the MCU buffer is allocated to addresses following the first address of the
internal data RAM work area + 0x100 bytes.
The size of the required MCU buffer is as follows:
Table 2-11. Size of MCU Buffer
Supported sampling ratio
Required size
4:1:1
0x300 bytes
2:1:1
0x200 bytes
1:1:1
0x180 bytes
Figure 2-8. Use of MCU Buffer (AP70732-B03)
If only a sampling ratio of up to 2:1:1 is used for compression, the memory size taken up by the structure
can be reduced by directly rewriting the structure definition of JPEG.H (MCU buffer size = 0x200 bytes).
If the sampling ratio of the JPEG file to be expanded is 4:1:1, and if an expansion library of 4:1:1 is linked,
it is recognized that the MCU buffer has size of 0x300 bytes, and 0x300 bytes from the first address are
overwritten without warning.
0x300 bytes
MCU buffer
Sampling ratio
of up to 1:1:1
Sampling ratio
of up to 2:1:1
Sampling ratio
of up to 4:1:1
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