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ST92195D Datasheet(PDF) 86 Page - STMicroelectronics

No. de pieza ST92195D
Descripción Electrónicos  48-96 Kbyte ROM HCMOS MCU WITH ON-SCREEN DISPLAY AND TELETEXT DATA SLICER
PDF  249 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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ST92195D Datasheet(HTML) 86 Page - STMicroelectronics

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ST92195C/D - TELETEXT DISPLAY STORAGE RAM INTERFACE
7.3 TELETEXT DISPLAY STORAGE RAM INTERFACE
7.3.1 Introduction
The Teletext Display RAM (TDSRAM) is used to
hold the Teletext data for display.
It can be shared by the following units:
– Acquisition Unit (AQD). A buffer containing the
teletext data extracted by the slicer from the in-
coming Composite Video signal CVBS1.
– Display Unit (DIS). This OSD generator is de-
scribed in a separate chapter.
– 40-byte buffer unit (MBT). A register mapped
buffer that can be directly accessed by the CPU.
– CPU accesses for control.
The necessary time slots are provided to each unit
for realtime response.
FEATURES:
s
Memory mapped in CPU Memory Space
s
Direct CPU access without significant slowdown
s
3 types of on-chip hardware DMA
s
Row-wise DMA for high speed data treatment
(bufferized 40-byte read - write)
Figure 47. General Block Diagram



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