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HT56RB688 데이터시트(PDF) 46 Page - Holtek Semiconductor Inc

부품명 HT56RB688
상세설명  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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Programming Considerations
Certain precautions must be taken when programming the LCD/LED. One of these is to ensure that the
Display Memory is properly initialised after the microcontroller is powered on. Like the General
Purpose Data Memory, the contents of the Display Memory are in an unknown condition after
power-on. As the contents of the Display Memory will be mapped into the actual display, it is
important to initialise this memory area into a known condition soon after applying power to obtain a
proper display pattern.
Consideration must also be given to the capacitive load of the actual LCD used in the application. As
the load presented to the microcontroller by LCD pixels can be generally modeled as mainly
capacitive in nature, it is important that this is not excessive, a point that is particularly true in the case
of the COM lines which may be connected to many LCD pixels. The accompanying diagram depicts
the equivalent circuit of the LCD.
One additional consideration that must be taken into account is what happens when the
microcontroller enters a Power Down condition. The LCDEN control bit in the LCDCTRL or LEDEN
bit in the LEDCTRL register permits the display to be powered off to reduce power consumption. If
this bit is zero, the driving signals to the display will cease, producing a blank display pattern but
reducing any power consumption associated with the LCD.
After Power-on, note that as the LCDEN and LEDEN bits will be cleared to zero, the display function
will be disabled.
The accompanying timing diagrams depict the display driver signals generated by the microcontroller
for various values of duty and bias. The huge range of various permutations only permit a few types to
be displayed here.
Rev. 1.10
46
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
C O M 0
C O M 1
C O M 2
C O M n
S E G 0
S E G 1
S E G 2
S E G n
LCD Panel Equivalent Circuit


유사한 부품 번호 - HT56RB688_13

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