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HM17CM256 Datasheet(PDF) 70 Page - Hynix Semiconductor |
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HM17CM256 Datasheet(HTML) 70 Page - Hynix Semiconductor |
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70 / 111 page  HM17CM256 - 70 - (34-19) RAM data length setting CS RS RD WR RE2 RE1 RE0 D7 D6 D5 D4 D3 D2 D1 D0 0 1 1 0 1 0 0 1 0 0 1 * * CKS WLS ( reset :{WLS}=0H, read address :9H) * : “Don’t care” WLS: Selection 8 bit access or 16 bit access at RAM access. Access with 16 bits data length is effective only at RAM access. The other accesses are 8 bits access ( command access ). WLS=”0”: RAM access is done by 8 bits data length. WLS=”1”: RAM access is done by 16 bits data length CKS: Selection the oscillator. CKS=”0”: internal oscillation mode ( default ). Internal oscillation mode should be used under condition of OSC1 and OSC2 open. CKS=”1”: external oscillation mode. External oscillation mode should be used under the condition of clock input by OSC1 port or resistor connection between OSC1 and OSC2 port. (34-20) Electric volume registers setting. CS RS RD WR RE2 RE1 RE0 D7 D6 D5 D4 D3 D2 D1 D0 0 1 1 0 1 0 0 1 0 1 0 DV3 DV2 DV1 DV0 ( read address :AH) CS RS RD WR RE2 RE1 RE0 D7 D6 D5 D4 D3 D2 D1 D0 0 1 1 0 1 0 0 1 0 1 1 * DV6 DV5 DV4 ( read address :BH) * : “Don’t care” ( reset :DV6~DV0=00H) Setting the electric volume code. The voltage range is divided into 127 levels by this register DV6 DV5 DV4 DV3 DV2 DV1 DV0 Output voltage 0 0 0 0 0 0 0 low 0 0 0 0 0 0 1 : : : : : 1 1 1 1 1 1 0 : 1 1 1 1 1 1 1 high The output voltage of VREG is determined by Eq. . VREG = VREF x N (N: booster coefficient) N=1 under the condition of boosting operation is not valid (booster coefficient register, VU=0H ). The LCD driving voltage VLCD is decided by VREG level or electric volume value (Eq. ). VLCD = 0.5 x VREG + M x (VREG - 0.5VREG) / 127 ( M : DV6~DV0 register value ) To prevent over voltage from being generated by electric volume setting, when the register value is set to upper side of electric volume, voltage level is not changed immediately. When the register value is set to lower side of electric volume, the voltage level is changed instantly. |
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