전자부품 데이터시트 검색엔진 |
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LC74723 데이터시트(PDF) 9 Page - Sanyo Semicon Device |
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LC74723 데이터시트(HTML) 9 Page - Sanyo Semicon Device |
9 / 12 page • Second byte Note: The register states are all set to zero when the LC74723 is reset with the RST pin. 5. COMMAND4 (Display control command) • First byte • Second byte Note: The register states are all set to zero when the LC74723 is reset with the RST pin. No. 4841-9/12 LC74723, 74723M DA Register Contents Remarks 0 to 7 name State Function 7 — 0 Second byte identification code 6 LC 0 An LC oscillator is used for the dot clock Selects the dot clock used for horizontal 1 A crystal oscillator is used for the dot clock direction character display. 5 HP5 0 (MSB) 1 4 HP4 0 1 3 HP3 0 1 2 HP2 0 1 1 HP1 0 1 0 HP0 0 (LSB) 1 DA Register Contents Remarks 0 to 7 name State Function 7 — 1 6 — 1 Command 4 identification code 5 — 0 Set display control. 4 — 0 3 TSTMOD 0 Normal operating mode This bit must be zero. 1 Test mode 2 RAMERS 0 The RAM erase operation requires about 1 Erase display RAM (set to 3F hexadecimal) 500 µs (It is executed in the DSPOFF state.) 1 OSCSTP 0 Do not stop the crystal oscillator or LC oscillator circuits. Valid when character display is off in external 1 Stop the crystal oscillator or LC oscillator circuits. synchronization mode. 0 SYSRST 0 Reset occurs when the CS pin is low, and 1 Reset all registers and turn the display off. the reset is cleared when CS is high. DA Register Contents Remarks 0 to 7 name State Function 7 — 0 Second byte identification code 6 EGL 0 Trimming level 0 (VBK0) Trimming level switching 1 Trimming level 1 (VBK1) 5 NON 0 Interlace (256.5 H per field) Interlace/non-interlace switching 1 Non-interlace (263 H per field) 4 EG 0 Trimming off 1 Trimming on 3 BK1 0 Blinking period: about 0.5 s Blinking state switching 1 Blinking period: about 1.0 s 0 Blinking off When blinking is specified for reversed 2 BK0 characters, the blinking will be between normal 1 Blinking on character and reversed character display. 1 RV 0 Reverse (character reversing) off 1 Reverse (character reversing) on 0 DSPON 0 Character display off 1 Character display on If HS is the horizontal display start position then: Tc: The oscillator period of the OSCIN and OUT pin oscillator in operating mode HS = Tc × (2Σ 2n HP n) n = 0 5 The horizontal display start position is set by the 6 bits HP0 to HP5. The weight of the low-order bit is 2Tc. |
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