參數(shù)資料
型號: μSAP70300-B03
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8 Bit Single Chip Microcontrollers
中文描述: 8位單片機微控制器
文件頁數(shù): 101/102頁
文件大?。?/td> 282K
代理商: ΜSAP70300-B03
91
CHAPTER 2 LIBRARY SPECIFICATIONS
Assuming that the address of the Y component of the pixel of VRAM to be accessed is in r8, execute the
instruction as follows:
ld.b
ld.b
ld.b
andi
andi
andi
0x0 [r8], r10
VRAM_GAP1 [r8], r11
VRAM_GAP2 [r8], r12
0xFF, r10, r10
0xFF, r11, r11
0xFF, r12, r12
As a result, the following are stored into the registers.
r10
r11
r12
Value of Y component
Value of Cb component
Value of Cr component
2.10.2 VRAM Access Function Used During Expansion
The functions required for VRAM access during expansion are as follows:
Table 2-31. VRAM Access Functions Required During Expansion
Function name
Supported sampling ratio
jpeg_putMCU_22
4:1:1 [H:V = 2:2]
jpeg_putMCU_41
4:1:1 [H:V = 4:1]
jpeg_putMCU_21
4:2:2
jpeg_putMCU_11
4:4:4
These functions write YCbCr-format data, stored in the MCU buffer in a specific format, to VRAM. The
functions corresponding to unnecessary sampling ratios need not be created. The user may not arbitrarily
determine the function names. Instead, the same function names as those listed in this table must be used.
The specifications of each function are as shown below.
Function name
jpeg_putMCU_xx (xx = 22, 41, 21, 11)
Outline
Exchanges and transfers data from the MCU buffer to VRAM.
Syntax
#include “jpeg.h”
void jpeg_putMCU_22 (JPEGINFO*dInfo )
void jpeg_putMCU_41 (JPEGINFO*dInfo )
void jpeg_putMCU_21 (JPEGINFO*dInfo )
void jpeg_putMCU_11 (JPEGINFO*dInfo )
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