參數(shù)資料
型號(hào): 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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 42/166頁
文件大小: 713K
代理商: ΜSAP70732-B03
42
μSAP705100-B03, μSAP70732-B03 USER'S MANUAL
(7) OS support
The compression, analysis, and expansion routines are reenterable. To execute a routine, specified
structures are required.
(8) Buffer used to store JPEG files
When executing a routine, a buffer is required to store the JPEG files. Because the file size varies with
each JPEG file, processing is stopped when the data reaches the end of the JPEG buffer, then restarted
by re-calling the routine after buffer processing (saving the contents of the buffer during compression, or
updating the buffer during expansion).
The size of the JPEG file buffer can be set to any value of 1 byte or greater. However, because register
dispatch is always performed between compression or expansion and buffer processing, allocate sufficient
memory to prevent register dispatch from being performed at excessively short intervals.
(9) Thumbnail expansion
In addition to expansion to normal size (the number of pixels written to the JPEG file header), an expansion
mode reduced to 1/4, 1/16, or 1/64 of the area can be selected (in this reduced expansion mode, expansion
can be implemented at high speed relative to expansion to normal size because the reverse DCT
transformation is designed for reduction).
(10) Clipping of expansion
When expanding the JPEG file, a rectangle can be clipped in MCU units and only the clipped part
expanded.
(11) Line processing
It is possible to stop processing per line processing of the number of vertical pixels of 1 MCU in a system
whose image memory cannot store the entire image.
(12) Internal RAM (AP705100-B03)
No internal instruction RAM is used.
An internal data RAM of 1024 bytes is used.
To obtain sufficient performance, 1024 bytes are necessary for each compression/expansion task.
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