HT56RB688_13 datasheet(40/164 Pages) HOLTEK

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Display Memory

An area of Data Memory is especially reserved for use for the LCD/LED display data. This data area is

known as the Display Memory. Any data written here will be automatically read by the internal display

driver circuits, which will in turn automatically generate the necessary LCD or LED driving signals.

Therefore any data written into this Memory will be immediately reflected into the actual display

connected to the microcontroller.

As the Display Memory addresses overlap those of the General Purpose Data Memory, it s stored in its

own independent Bank 1 and Bank 2 area. The Data Memory Bank to be used is chosen by using the

Bank Pointer, which is a special function register in the Data Memory named BP. To access the Display

Memory therefore requires first that Bank 1 or Bank 2 is selected by writing a value of 01H or 02H to

the BP register. After this, the memory can then be accessed by using indirect addressing through the

use of Memory Pointer MP1. With Bank 1 or Bank 2 selected, then using MP1 to read or write to the

memory area starting with address 80H will result in operations to the Display Memory. Directly

addressing the Display Memory is not applicable and will result in a data access to the Bank 0 General

Purpose Data Memory.

The accompanying Display Memory Map diagrams shows how the internal Display Memory is

mapped to the Segments and Commons of the display for the device.

The accompanying waveform diagrams show the generated waveforms for a range of duty and bias

types. The huge number of permutations of available for the LCD and LED waveform types does not

permit all types to be depicted.

Rev. 1.10

April 15, 2013

HT56RB688

TinyPowerTM A/D type Smart Card OTP MCU

with LCD, DAC, ISO 7816 and USB Interfaces

R t y p e 1 / 3 B i a s

V L C D

V A

V B

L C D

P o w e r S u p p l y

V C

( = V L C D ´ 2 / 3 )

( = V L C D ´ 1 / 3 )

( = V L C D )

L C D O n / O f f

R t y p e 1 / 4 B i a s

R t y p e 1 / 5 B i a s

V L C D

V A

V B

L C D

P o w e r S u p p l y

V C

( = V L C D ´ 4 / 5 )

( = V L C D ´ 3 / 5 )

( = V L C D )

L C D O n / O f f

V L C D

V A

V B

L C D

P o w e r S u p p l y

V D

( = V L C D ´ 3 / 4 )

( = V L C D ´ 1 / 4 )

( = V L C D )

L C D O n / O f f

V C

( = V L C D ´ 2 / 4 )

V D

V E

( = V L C D ´ 2 / 5 )

( = V L C D ´ 1 / 5 )

R Type Bias Voltage Levels

HT56RB688 Datasheet(PDF) 40 Page - Holtek Semiconductor Inc

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