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HT56RB688 Scheda tecnica(PDF) 44 Page - Holtek Semiconductor Inc |
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HT56RB688 Scheda tecnica(HTML) 44 Page - Holtek Semiconductor Inc |
44 / 164 page Bit 2 COMP: Common polarity selection bit 0: low active 1: high active Bit 1 LEDEN: LED function enable control 0: disable 1: enable In Normal, Slow or Idle mode, the LED function will be enabled or disabled according to that the LEDEN bit is 1 or 0. In Sleep mode, the LCD function will always be disabled. Bit 0 Unimplemented, read as ²0² LCD Voltage Source and Biasing The time and amplitude varying signals generated by the LCD Driver function require the generation of several voltage levels for their operation. The number of voltage levels used by the signal depends upon the value of the BIAS bits in the LCDCTRL register. The device supports the R type biasing and the bias resistor can be selected via the RSEL bits in the LCDCTRL register. For the R type biasing an external LCD voltage source must be supplied on pin VLCD to generate the internal biasing voltages. The VLCD voltage could be the microcontroller power supply VDD or some other voltage source less than or equal to the VDD voltage. For the R type 1/3 bias selection, four voltage levels VSS, VA, VB and VC are utilised. The voltage VA is equal to VLCD and VB is equal to VLCD´2/3 while VC is equal to VLCD ´ 1/3. For the R type 1/4 bias selection, there are five voltage levels to be used. The difference of each bias voltage is 1/4 ´ VLCD voltage. For 1/5 bias selection, the difference of each bias voltage is 1/5 ´VLCD. In addition to selecting the LCD bias level, several values of bias resistor can be chosen using bits in the LCDCTRL register. Different values of internal bias resistors can be selected using the RSEL0 and RESEL1 bits in the LCDCTRL register. This bias resistor along with the voltage on pin VLCD will determine the bias current. Rev. 1.10 44 April 15, 2013 HT56RB688 TinyPowerTM A/D type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces V S S V D D V S S V D D C O M 0 i n l o w a c t i v e S E G i n l o w a c t i v e C O M 0 i n l o w a c t i v e S E G i n h i g h a c t i v e C O M 0 i n h i g h a c t i v e S E G i n l o w a c t i v e C O M 0 i n h i g h a c t i v e S E G i n h i g h a c t i v e V S S V D D V S S V D D V S S V D D V S S V D D V S S V D D V S S V D D 0 1 2 3 8 7 LED Static Mode Normal Operation V S S V D D V S S V D D V S S V D D C O M 0 C O M 1 S E G LED 1/4 Duty, COM High Active, SEG Low Active, Display Off |
Codice articolo simile - HT56RB688_13 |
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Descrizione simile - HT56RB688_13 |
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