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HT56RB688 Scheda tecnica(PDF) 44 Page - Holtek Semiconductor Inc

Il numero della parte HT56RB688
Spiegazioni elettronici  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 Scheda tecnica(HTML) 44 Page - Holtek Semiconductor Inc

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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


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