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| 型號(hào)： | M34552G8FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP48 |
| 封裝： | 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48 |
| 文件頁(yè)數(shù)： | 34/143頁(yè) |
| 文件大小： | 0K |
| 代理商： | M34552G8FP |
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13: SWIVELVIEWTM
S1D13505F00A HARDWARE FUNCTIONAL
EPSON
1-117
SPECIFICATION (X23A-A-001-12)
13.3 Physical Memory Requirement
Because the programmer must now deal with a virtual display, the amount of image buffer required
for a particular display mode has increased. The minimum amount of image buffer required is:
Minimum Required Image Buffer (bytes)
= (1024
× H) × 2
for 16 bpp mode
= (1024
× H)
for 8 bpp mode
For single panel, the required display buffer size is the same as the image buffer required. For dual
panel, the display buffer required is the sum of the image buffer required and the half-frame buffer
memory required. The half-frame buffer memory requirement is:
Half-Frame Buffer Memory (bytes)
= (W
× H) / 4
for color mode
= (W
× H) / 16
for monochrome mode
The half-frame buffer memory is always located at the top of the physical memory.
For simplicity the hardware cursor and ink layer memory requirement is ignored. The hardware cur-
sor and ink layer memory must be located at 16K byte boundaries and it must not overlap the image
buffer and half-frame buffer memory areas.
Even though the virtual display is 1024
×1024 pixels, the actual panel window is always smaller.
Thus it is possible for the display buffer size to be smaller than the virtual display but large enough
to t both the required image buffer and the half-frame buffer memory. This poses a maximum
“accessible” horizontal virtual size limit.
Maximum Accessible Horizontal Virtual Size (pixels)
= (Physical Memory – Half-Frame Buffer Memory) / 2048
for 16 bpp mode
= (Physical Memory – Half-Frame Buffer Memory) / 1024
for 8 bpp mode
For example, a 640
×480 single panel running 8 bpp mode requires 480K byte of image buffer and
0K byte of half-frame buffer memory. The virtual display size is 1024
×1024 = 1M byte. The pro-
grammer may use a 512K byte DRAM which is smaller than the 1M byte virtual display but greater
than the 480K byte minimum required image buffer. The maximum accessible horizontal virtual size
is = (512K byte - 0K byte) / 1024 = 512. The programmer therefore has room to pan the portrait win-
dow to the right by 512 - 480 = 32 pixels. The programmer also should not read/write to the memory
beyond the maximum accessible horizontal virtual size because that memory is either reserved for
the half-frame buffer or not associated with any real memory at all.
The following table summarizes the DRAM size requirement for SwivelViewTM using different
panel sizes and display modes. Note that DRAM size for the S1D13505 is limited to either 512K
byte or 2M byte. The calculation is based on the minimum required image buffer size. The calcu-
lated minimum display buffer size is based on the image buffer and the half-frame buffer only; it
does not take into account the hardware cursor/ink layer and so it may or may not be sufcient to
support it – this is noted in the table. The hardware cursor requires 1K byte of memory and the 2-bit
ink layer requires (W
× H) / 4 bytes of memory; both must reside at 16K byte boundaries but only
one is supported at a time. The table shows only one possible sprite/ink layer location – at the high-
est possible 16K byte boundary below the half-frame buffer which is always at the top.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M34552M8H-XXXFP | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP48 |
| M34552G8HFP | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP48 |
| M34556G8HFP | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| M34556M8-XXXFP | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42 |
| M34556M8H-XXXFP | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M34552G8HFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34552M4H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34552M4-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34552M8H-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34552M8-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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