HT9580 datasheet(20/63 Pages) HOLTEK

20 / 63 page

HT9580

April 28, 2000

Preliminary

The Mask ROM bank point register can switch

between the internal 2 Mbits Mask ROM or an

external up to 2 Mbits Mask ROM space. The se-

lection table is based on the following table. The

space size of each Mask ROM bank is 8 Kbytes.

The bits BP_MODM1 and BP_MODM0 define

whether internal or external Mask ROM devices

are used. (BP_MODM1, BP_MODM0)=(0, 1), se-

lects the internal Mask ROM device.

(BP_MODM1, BP_MODM0)=(1, 0), selects the

external Mask ROM device. The internal Mask

ROM can switch from bank 0 to bank 31 and the

external Mask ROM can switch from bank 0 to

bnak 31 by software programming. In addition,

the address range of the internal/external Mask

ROMwillallrangefrom1000Hto2FFFH.

The Mask ROM bank point register selection

table is shown in the table.

PA D a t a

PA W U E

On e

S hot

Ci r c u i t

CP U

PA I M

PA C

Pu l l - u p

R e si st o r

V DD

I/O structure of port A

Mask ROM (Character ROM) bank point register

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

State on

POR

0015H

MROM-BP BP_MODM1 BP_MODM0

M_BP5

M_BP4

M_BP3

M_BP2

M_BP1

M_BP0

0000 0000

BP_MODM1 BP_MODM0 M_BP5 M_BP4 M_BP3 M_BP2 M_BP1 M_BP0 BP Value

Memory Area

Reserved

Internal 2 Mbits Mask ROM (low 8 Kbytes)

¯¯

Internal 2 Mbits Mask ROM (High 8

Kbytes)

Reserved

¯¯

Reserved

External 2 Mbits Mask ROM (low 8 Kbytes)

¯¯

External 2 Mbits Mask ROM (High 8

Kbytes)

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