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ST2204 Datasheet(PDF) 9 Page - Sitronix Technology Co., Ltd.

Part No. ST2204
Description  8 BIT Integrated Microcontroller with 512K Bytes ROM
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Manufacturer  SITRONIX [Sitronix Technology Co., Ltd.]
Direct Link  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST2204 Datasheet(HTML) 9 Page - Sitronix Technology Co., Ltd.

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ST2204
Ver 0.6
9/24
2008/11/10
8
8.. C
CH
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P--S
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EL
LE
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The ST2204 builds in one chip-select signal ( CS0 ) for
embedded 512K 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 512K bytes memory which are controlled by
MMD pin. Tie MMD to ground to select normal mode and
enable internal ROM for the first 512K 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 8-1 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.
Note: Write “1” to bit of port direction control
register PCD, then to bit of port
function-select register PFD to activate the
designated chip-select signal.
A. Normal Mode
B. Emulation Mode
FIGURE 8-1 Connections Of MMD/ CS0


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