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參數(shù)資料
| 型號(hào)： | SDA5254-2 |
| 廠商： | SIEMENS A G |
| 元件分類： | 圖文 |
| 英文描述： | ICs for Consumer Electronics |
| 中文描述： | TELETEXT DECODER, PDIP52 |
| 文件頁(yè)數(shù)： | 55/143頁(yè) |
| 文件大?。?/td> | 1050K |
| 代理商： | SDA5254-2 |
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SDA 525x
Semiconductor Group
55
1998-04-08
6.3.2.2
The internal data memory is divided into four blocks: the lower 128 byte of RAM, the
upper 128 byte of RAM, the 128-byte Special Function Register (SFR) area and the up
to 10 Kbyte additional RAM (
Figure 21
). Because the upper RAM-area and the SFR-
area share the same address locations, they are accessed through different addressing
modes.
The internal data RAM-address space is 0 to 255. Four banks of eight registers each
occupy locations 0 through 31. Only one of these banks may be enabled at a time
through a two-bit field in the PSW. In addition, 128-bit locations of the on-chip RAM are
accessible through direct addressing.
These bits reside in internal data RAM at byte locations 32 through 47, as shown in
Table 11
. The lower 128 bytes of internal data RAM can be accessed through direct or
register-indirect addressing, the upper 128 bytes of internal data RAM through register-
indirect addressing and the special function registers through direct addressing.The
stack can be located anywhere in the internal data RAM-address space. The stack depth
is limited only by the available internal data RAM, thanks to an 8-bit relocatable stack
pointer. The stack is used for storing the program counter during subroutine calls and
may also be used for passing parameters. Any byte of internal data RAM or special
function registers accessible through direct addressing can be pushed/popped.
An additional on-chip RAM-space called “XRAM” extends the internal RAM-capacity.
The up to 10 Kbytes of XRAM are accessed by MOVX @DPTR. XRAM is located in the
upper area of the address space. 1 Kbyte of the XRAM, called VBI Buffer, is reserved
for storing teletext data and another up to 8 Kbyte of the XRAM, called Display Chapters,
are reserved for storing up to 8 display chapters (see
Figure 21
). Unused memory area
of the VBI Buffer and the Display Chapters can be used by the controller as general RAM
space.
Internal Data RAM
:
Table 10
XRAM Address Space
Function
VBI Buffer
Display Chapter 0 - 7
CPU XRAM
(1)
SDA 5251, SDA 5252 C000 - C3FF only
(2)
SDA 5250, SDA 5254 and SDA 5255 only
Byte Address (hex.)
F400 - F7FF
C000 - DFFF
(1)
F800 - FBFF
(2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SDA 5251 | TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）) |
| SDA 5252 | TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）) |
| SDA 5254 | TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器（含ROM 型 ）) |
| SDA5254M | ICs for Consumer Electronics |
| SDA525X | ICs for Consumer Electronics |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SDA5254M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5254M-2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5255 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5255-2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5255M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
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