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參數(shù)資料
| 型號： | SAA5677HL |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Enhanced TV microcontrollers with On-Screen Display (OSD) |
| 中文描述： | 與微控制器在強(qiáng)化電視屏幕顯示（OSD） |
| 文件頁數(shù)： | 51/116頁 |
| 文件大?。?/td> | 532K |
| 代理商： | SAA5677HL |
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2002 May 06
51
Philips Semiconductors
Objective specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA567x; SAA569x
21 MEMORY INTERFACE
The memory interface controls access to the embedded
DRAM, refreshing of the DRAM and page clearing. The
DRAM is shared between Data Capture, display and
microcontroller sections.
The Data Capture section uses the DRAM to store
acquired information that has been requested. The display
reads from the DRAM information and converts it to RGB
values. The microcontroller uses the DRAM as embedded
auxiliary RAM.
21.1
Memory structure
The memory is partitioned into two distinct areas, the
dedicated Auxiliary RAM area and the Display RAM area.
When not being used for Data Capture or display, the
Display RAM area can be used as an extension to the
auxiliary RAM area.
21.1.1
A
UXILIARY
RAM
The Auxiliary RAM is not initialised at power-up and must
be initialised by the application software. Its contents are
maintained during Idle mode and Standby mode, but are
lost if Power-down mode is entered.
21.1.2
D
ISPLAY
RAM
The Display RAM is initialised on power-up to a value
of 20H throughout. The contents of the Display RAM are
maintained when entering Idle mode. If Idle mode is exited
using an interrupt, the contents are unchanged; if Idle
mode is exited using an external reset, the contents are
initialised to 20H.
Full Closed Caption display requires display RAM from
8000H to 845FH. The memory from 8460H to 84FFH
(must be initialised by the application software) can be
utilised as an extension to the dedicated contiguous
Auxiliary RAM that occupies 0000H to 07FFH.
21.2
Memory mapping
The dedicated auxiliary RAM area occupies 2 kbytes, with
an address range from 0000H to 07FFH. The Display
RAM occupies a maximum of 12 kbytes with an address
range from 2000H to 5000H for TXT mode and
8000H to 84FFH for CC mode (see Fig.15). Although
having different address ranges, the two modes occupy
physically the same DRAM area.
21.3
CCBASE SFR
The SAA567x; SAA569x incorporates a CCBASE SFR,
which enables CC Display data to be accessed from any
1-kbyte partition within the Display memory. This SFR
allows the CC Base address for Closed Caption Display
memory to overlap Teletext memory at the following
hexadecimal boundaries of the 80C51 microcontroller
‘MOVX’ address space:
2000H (same as SAA55x default), 2400H, 2800H, 2C00H,
3000H, 3400H, 3800H, 3C00H, 4000H, 4400H, 4800H,
4C00H, 5000H, 5400H, 5800H, 5C00H, 6000H, 6400H,
6800H and 6C00H.
TheresetvaluefortheCCBASEAddressSFRis20H,thus
ensuring software compatibility with other variants in the
SAA55xx family. Register bits CCBASE1 and CCBASE0
must always be set to zero at 1 kbyte boundaries.
Figure 15 shows the default setting for the CC Display
memory.
handbook, halfpage
GSA061
upper 32 kbytes
AUXILIARY
TXT BLOCK 0
0000H
0800H
2000H
TXT BLOCK 9
2400H
TXT BLOCK 1
2800H
TXT BLOCK 2
2C00H
TXT BLOCK 3
3000H
TXT BLOCK 4
3400H
TXT BLOCK 5
3800H
TXT BLOCK 6
3C00H
TXT BLOCK 7
4000H
TXT BLOCK 8
TXT BLOCK 10
TXT BLOCK 19
4400H
4800H
4C00H
5000H
7FFFH
CC DISPLAY
8000H
84FFH
FFFFH
Fig.15 DRAM memory mapping.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA5700GP | Chinese Character System Teletext CCST decoder |
| SAA5700 | Chinese Character System Teletext CCST decoder |
| SAA6579 | Radio Data System RDS demodulator |
| SAA6581 | RDS/RBDS demodulator |
| SAA6581T | RES 15.8K OHM 1/16W .5% 0603 SMD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA567X | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD) |
| SAA5695HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD) |
| SAA5697HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD) |
| SAA569X | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display (OSD) |
| SAA5700 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Chinese Character System Teletext CCST decoder |
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