HT56RB688 datasheet(41/164 Pages) HOLTEK

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LCD/LED Registers

Control Registers in the Data Memory, are used to control the various setup features of the LCD/LED

Driver. There is one control register named LCDCTRL for the LCD function and one named

LEDCTRL for the LED function. Various bits in these registers control functions such as duty type,

bias type, bias resistor selection as well as overall LCD enable and disable. The LCDEN bit in the

LCDCTRL and LEDEN bit in the LEDCTRL register, which provide the overall LCD/LED

enable/disable function, will only be effective when the device is in the Normal, Slow or Idle Mode. If

the device is in the Sleep Mode, the display will always be disabled. Bits RSEL0 and RSEL1 in the

LCDCTRL register is used to select the internal bias resistors to supply the LCD panel with the correct

bias voltages. A choice to best match the LCD panel used in the application can be selected also to

minimise bias current. The TYPE bit in the same register is used to select whether Type A or Type B

LCD control signals are used.

The register named LCDIO is used to determine if the output function of display pins SEG0~ SEG23

are used as segment drivers or CMOS outputs. If these pins are used as general I/O pins, then the I/O

function including the input/output control, the related output data and pull-high functions is managed

by the original corresponding I/O Port control and data register together with the pull-high control

LCD Output Control Register - LCDIO

Bit

76543210

Name

¾¾¾¾¾

LCDPF

LCDPE

LCDPD

R/W

¾¾¾¾¾

R/W

POR

¾¾¾¾¾

000

Bit 7~3

Unimplemented, read as

²0²

Bit 2

LCDPF: LCD SEG16~SEG23 or I/O Port F selection bit

0: SEG16~SEG23

1: I/O Port F

Bit 1

LCDPE: LCD SEG8~SEG15 or I/O Port E selection bit

0: SEG8~SEG15

1: I/O Port E

Bit 0

LCDPD: LCD SEG0~SEG7 or I/O Port D selection bit

0: SEG0~SEG7

1: I/O Port D

LCD Reset Function

The LCD has an internal reset function that is an OR function of the inverted LCDEN bit in the

LCDCTRL register and the Sleep function. The LCD reset signal is active high. The LCDEN signal is

the inverse of the LCDEN bit in the LCDCTRL register.

Reset LCD = Sleep Mode or LCDEN.

LEDEN = 0 and LCDEN = 1 must be enabled to activate the LCDCTRL register function.

LCDEN

Sleep Mode

Reset LCD

Off

0On

Off

1On

LCD Reset Function

HT56RB688

TinyPowerTM A/D type Smart Card OTP MCU

with LCD, DAC, ISO 7816 and USB Interfaces

Rev. 1.00

December 2, 2011

HT56RB688 датащи(PDF) 41 Page - Holtek Semiconductor Inc

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