LC74725 Sanyo Semiconductor Corporation, LC74725 Datasheet
LC74725
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LC74725 Summary of contents
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... Ordering number : EN5213A Overview The LC74725 and LC74725M are built-in EDS on-screen display controller CMOS LSI products that display characters and patterns screen under microprocessor control. The characters displayed have dot format, and a dot interpolation function is provided. These LSIs can display ten lines of 24 characters each ...
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... DD Note: Both V 1 pins must be connected to the power supply. DD LC74725, 74725M Description Ground connection (digital system ground) Connections for the external crystal and capacitors used to form a crystal oscillator for internal synchronizing signal generation. Alternatively, these pins can be used for external clock input (2fsc or 4fsc) ...
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... Sync level V SN Pedestal level V PD Color burst low level V CBL Color burst high level V CBH Background color low level V RSL Background color high level V RSH LC74725, 74725M Symbol Conditions V max max All input pins IN V max LN21, CPDT, SEP , SYNC ...
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... Minimum input pulse width t CKL t CKH Data setup time t ICK Output delay time t CKO Note: Follows the OSD timing for the CMOS output circuit type. LC74725, 74725M Conditions When the sync level is 0 OUT DD When the sync level is 1 OUT DD When the sync level is 0 ...
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... Figure 2 EDS Serial Output Test Conditions (N-Channel Open-Drain Circuit) Note: The O/E signal is output from the SYNC LN21 outputs the even field when MOD0 is low, and both fields when MOD0 is high. LC74725, 74725M pin when SEL0 is high. JDG Figure 3 O/E and LN21 Output Timing ...
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... Note: The LC74725 hardware will not transfer data to the output buffer while CS2 is low. Therefore the decoder LSI (or microprocessor) must restore CS2 from the low level to the high level after completing a data transfer control cycle ...
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... System Block Diagram LC74725, 74725M No. 5213-7/16 ...
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... LC74725/M locks into the display character data write mode, and another first byte cannot be written. When a high level is input to the CS pin, the LC74725/M is set to COMMAND0 (display memory write address setup mode). ...
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... Command 1 identification code Set up display character data write. Register content Function Character attribute off Character attribute on Character code ( hexadecimal) Note Note When this command is input, the LC74725/M locks into the display character data write mode until the CS1 pin goes high. Note No. 5213-9/16 ...
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... HS20 1 1 — HS10 1 LC74725, 74725M Register content Function Command 2 identification code Set the vertical display start position and vertical character size. 1H per dot 2H per dot 1H per dot 2H per dot Register content Function Second byte identification bit Crystal oscillator frequency: 2fsc ...
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... BK1 BK0 DSPON 1 LC74725, 74725M Register content Function Second byte identification bit An LC oscillator is used for the dot clock. A crystal oscillator is used for the dot clock the horizontal start position then Tc: Period of the oscillator connected to OSCIN/OSCOUT in operating mode. Register content Function ...
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... CTL2 SEL0 1 Note: The register states are all set to zero when the LC74725/M is reset with the RST pin. LC74725, 74725M Register content Function Command 5 identification code Synchronizing signal control settings Background color present No background color (only the background level is set) ...
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... The display consists of 10 lines of 24 characters each and thus up to 240 characters can be displayed. Enlarging the size of the characters reduces the number of characters that can be displayed to under 240 characters. Display memory addresses are specified as row ( decimal) and column ( decimal) addresses. Display Screen Structure (display memory addresses) LC74725, 74725M No. 5213-13/16 ...
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... V : Background color low RSL V : Border BK1 V : Border BK0 V : Pedestal Color burst low CBL V : Sync 5. LC74725, 74725M Output Level Waveform (V OUT Output voltage [V] Output voltage [V] 2.69 2.88 2.08 2.28 1.72 1.91 1.56 1.75 2.13 2.30 1.55 1.73 1.40 1.59 1.09 1.28 0.81 1 ...
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... Application Circuit Examples (Connected to a Y/C1 chip) 1. External system clock input Note: Values listed are reference values. LC74725, 74725M No. 5213-15/16 ...
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... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of December, 1997. Specifications and information herein are subject to change without notice. LC74725, 74725M No. 5213-16/16 ...