HT9580 datasheet(22/63 Pages) HOLTEK

22 / 63 page

HT9580

April 28, 2000

Preliminary

The SRAM bank point register can switch to ei-

ther external 256 Kbytes or internal 32 Kbytes

SRAM space. The selection table is based on the

following table. The space size of each SRAM

bank is 8 Kbytes. Bits BP_MODS1 and

BP_MODS0 define whether internal or exter-

nal SRAM devices are used. (BP_MODS1,

BP_MODS0)=(0, 1), is for internal SRAM de-

vices. (BP_MODS1, BP_MODS0)=(1, 0), is for

external SRAM devices. The internal SRAM

would switch from bank 0 to bank 3 and the ex-

ternal SRAM would switch from bank 0 to bank

31 by software programming. In addition, the

address range of the internal/external SRAM

will all range from 3000H to 4FFFH.

SRAM bank point register

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

State on

POR

0016H

SRAM-BP BP_MODS1 BP_MODS0

S_BP5

S_BP4

S_BP3

S_BP2

S_BP1

S_BP0

0000 0000

BP_MODS1 BP_MODS0 S_BP5

S_BP4

S_BP3

S_BP2

S_BP1

S_BP0 BP Value

Memory Area

Reserved

Internal 32 Kbits SRAM (Low 8 Kbytes)

¯¯

Internal 32 Kbits SRAM (High 8 Kbytes)

Reserved

¯¯

Reserved

External 256 Kbits SRAM (Low 8 Kbytes)

¯¯

External 256 Kbits SRAM (High 8 Kbytes)

LCD control and data register

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

State on

POR

0017H

LCD_CTRL LCD-CHIP1 LCD-CHIP0 LCD-CLK CLK-MOD

LCD-CS1

LCD-CS0

LCD-A0

LCD-WRB 0000 1101

0018H

LCD_CMD

LCD_D7

LCD_D6

LCD_D5

LCD_D4

LCD_D3

LCD_D2

LCD_D1

LCD_D0

uuuu uuuu

The LCD control and command registers are

used for LCD driver interface. There are three

kinds of LCD driver chips available for the

HT9580. These LCD drivers are SED15X(KSX)

series, Motorola LCD driver chip MC141X se-

ries and HD66410 respectively according to the

following ²LCD-CHIP0² and ²LCD-CHIP1² bit

table settings. The combination of the

LCD_CMD and LCD-CTRL registers can con-

trol the SED15X(KSX), MC141X series or

HD66410 LCD drivers. Bits LCD-CS0/1 of the

LCD-CTRL register corresponds to the chip se-

lect pin of the LCD driver. The bit ²LCD-CS0² is

used to control the master LCD driver chip

while ²LCD-CS1² is for the slave LCD driver

chip. Both bits are active low. The bit

²CLK_MOD² is used to enable or disable the

pin out of LCD_CL. If the bit is set low, the

clock output of pin LCD_CL will be disabled,

otherwise the LCD_CL clock will be set accord-

ing to the following Truth Table.

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