ST2202A datasheet(19/75 Pages) SITRONIX

19 / 75 page

ST2202A

Ver 2.5

19/75

9/16/2008

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The ST2202 builds in one chip-select signal ( CS0 ) for

embedded 256K bytes mask ROM and six chip-select signals

multiplexed with PD5~0 of Port-D which are used to select

external devices on the address and data bus. There are two

options for the first 256K bytes memory which are controlled by

MMD pin. Tie MMD to ground to select normal mode and

enable internal ROM for the first 256K bytes memory. Connect

MMD to chip-select of an external device to select emulation

mode and disable internal ROM. After reset cycles, MMD

changes to an output and outputs chip-select signal CS0 .

Refer to FIGURE 10-1 for two connections of different modes.

Two bits CSM[1:0] of port miscellaneous register (PMCR)

select four modes of CSL which define the memory size of

each external chip-select. If CSM0 equals “1”, chip-select

signal CS6 changes to be address signal A23 to make one

single device of 16M bytes at CS5 possible. The address

range of CSx of higher number follows the range of previous

one of lower number. Refer to TABLE 10-2 for configurations of

all chip-selects in different modes.

Note: Write “1” to bit of port direction control

function-select register PFD to activate the

designated chip-select signal.

A. Normal Mode

B. Emulation Mode

FIGURE 10-1 Connections Of MMD/ CS0

TABLE 10-2 Memory Configurations Of Chip-selects

First 256K

External

Chip-select

Modes

Memory Range and Size of Chip-selects

Total Support

Memory Size

CS0 ,

MMD/ CS0

CSM[1:0]

CS1

CS2

CS3

CS4

CS5

CS6 /A23

0 0

$1000000~

$17FFFFF

(

8M bytes)

$1800000~

$1FFFFFF

(

8M bytes)

0 1

$0400000~

$04FFFFF

(

1M bytes)

$0500000~

$05FFFFF

(

1M bytes)

$0600000~

$07FFFFF

(

2M bytes)

$0800000~

$0FFFFFF

(

8M bytes) $1000000~

$1FFFFFF

(

16Mbytes)

A23

28M + 256K

Bytes

1 0

$2000000~

$27FFFFF

(

8M bytes)

$2800000~

$2FFFFFF

(

8M bytes)

$0000000~

$003FFFF

(

256Kbyte)

1 1

$0400000~

$07FFFFF

(

4M bytes)

$0800000~

$0FFFFFF

(

8M bytes)

$1000000~

$17FFFFF

(

8M bytes)

$1800000~

$1FFFFFF

(

8M bytes) $2000000~

$2FFFFFF

(

16Mbytes)

A23

44M + 256K

Bytes

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