HT95R64 datasheet(51/82 Pages) HOLTEK

51 / 82 page

HT95R64/HT95R65

Rev. 1.00

March 3, 2010

The Sleep Mode or Idle Mode is initialised by a HALT

instruction and results in the following.

· The system clock will be turned off.

· The WDT function will be disabled if the WDT clock

source is the instruction clock.

· The WDT function will be disabled if the WDT clock

source is the 32768Hz oscillator in the Idle mode.

· The WDT will still function if the WDT clock source is

the WDT internal oscillator.

· If the WDT function is still enabled, the WDT counter

and WDT prescaler will be cleared and resume

counting.

· The contents of the on chip Data Memory and

registers remain unchanged.

· All the I/O ports maintain their original status.

· The PDF flag is set and the TO flag is cleared by

hardware.

SCOM Function for LCD

The devices have the capability of driving external LCD

panels. The common pins for LCD driving, SCOM0~

SCOM3, are pin shared with certain pin on the PD0~

PD3 port. The LCD signals (COM and SEG) are gener-

ated using the application program.

LCD Operation

An external LCD panel can be driven using this device

by configuring the PD0~PD3 pins as common pins and

using other output ports lines as segment pins. The LCD

driver function is controlled using the SCOMC register

which in addition to controlling the overall on/off function

also controls the bias voltage setup function. This en-

ables the LCD COM driver to generate the necessary

VDD/2 voltage levels for LCD 1/2 bias operation.

The SCOMEN bit in the SCOMC register is the overall

master control for the LCD Driver, however this bit is

used in conjunction with the COMnEN bits to select

which Port D pins are used for LCD driving. Note that the

Port Control register does not need to first setup the pins

as outputs to enable the LCD driver operation.

SCOMEN

COMnEN

Pin Function

O/P Level

I/O

0or1

I/O

0or1

SCOMN

VDD/2

Output Control

LCD Bias Control

The LCD COM driver enables a range of selections to

be provided to suit the requirement of the LCD panel

which is being used. The bias resistor choice is imple-

mented using the ISEL1 and ISEL0 bits in the SCOMC

S C O M C R e g i s t e r

b 7

b 0

C O M 0 E N

P D 0 o r S C O M 0 s e l e c t i o n

0 : G P I O

1 : S C O M 3

P D 1 o r S C O M 1 s e l e c t i o n

0 : G P I O

1 : S C O M 3

P D 2 o r S C O M 2 s e l e c t i o n

0 : G P I O

1 : S C O M 3

P D 3 o r S C O M 3 s e l e c t i o n

0 : G P I O

1 : S C O M 3

S C O M m o d u l e o n / o f f c o n t r o l

0 : d i s a b l e

1 : e n a b l e

S C O M n c a n b e e n a b l e b y C O M n E N i f S C O M E N = 1

S C O M o p e r a t i n g c u r r e n t s e l e c t i o n ( V D D = 5 V )

I S E L 1 , I S E L 0 :

0 0 : 2 5 m A

0 1 : 5 0 m A

1 0 : 1 0 0 m A

1 1 : 2 0 0 m A

R e s e r v e d B i t

1 : U n p r e d i c t a b l e o p e r a t i o n - b i t m u s t N O T b e s e t h i g h

0 : C o r r e c t l e v e l - b i t m u s t b e r e s e t t o z e r o f o r c o r r e c t o p e r a t i o n

C O M 1 E N

C O M 2 E N

C O M 3 E N

S C O M E N

I S E L 0

I S E L 1

SCOMC Register

V D D

S C O M 0 ~

S C O M 3

S C O M E N

C O M n E N

V D D / 2

S C O M o p e r a t i n g c u r r e n t

LCD COM Bias

HT95R64 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc

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