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HT56RB688 Folha de dados(PDF) 39 Page - Holtek Semiconductor Inc

Nome de Peças HT56RB688
Descrição Electrónicos  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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Programming Considerations
Within the user program, one of the first things to consider is port initialisation. After a reset, all of the
I/O data and port control registers will be set high. This means that all I/O pins will default to an input
state, the level of which depends on the other connected circuitry and whether pull-high selections
have been chosen. If the port control registers, PAC, PBC, etc., are then programmed to setup some
pins as outputs, these output pins will have an initial high output value unless the associated port data
registers, PA, PB, etc., are first programmed. Selecting which pins are inputs and which are outputs can
be achieved byte-wide by loading the correct values into the appropriate port control register or by
programming individual bits in the port control register using the ²SET [m].i² and ²CLR [m].i²
instructions. Note that when using these bit control instructions, a read-modify-write operation takes
place. The microcontroller must first read in the data on the entire port, modify it to the required new
bit values and then rewrite this data back to the output ports.
Port A has the additional capability of providing wake-up functions. When the device is in the Power
Down Mode, various methods are available to wake the device up. One of these is a high to low
transition of any of the Port A pins. Single or multiple pins on Port A can be setup to have this function.
LCD and LED Driver
For large volume applications, which incorporate an LCD in their design, the use of a custom display
rather than a more expensive character based display reduces costs significantly. However, the
corresponding COM and SEG signals required, which vary in both amplitude and time, to drive such a
custom display require many special considerations for proper LCD operation to occur. The device
contains a LCD Driver function, with their internal LCD signal generating circuitry and various
options, will automatically generate these time and amplitude varying signals to provide a means of
direct driving and easy interfacing to a range of custom LCDs.
Additionally the device also includes LED driver circuitry which can generated the required signals to
drive the COM and SEGMENT signals for LED panels. The device includes a wide range of options to
enable LCD and LED displays of various types to be driven. The table shows the range of options
available across the device range.
Duty
Driver No.
Bias
Bias Type
Wave Type
1/8
88
´8
1/3, 1/4, 1/5
RA, B
1/16
80
´16
LCD Selections
LED Duty
LED Driver No.
Static
88
´1
1/4
88
´4
1/8
88
´8
1/12
80
´12
1/16
80
´16
LED Selections
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
Rev. 1.10
39
April 15, 2013
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
W r i t e t o P o r t
R e a d f r o m P o r t
S y s t e m C l o c k
P o r t D a t a
Read/Write Timing


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