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ST2205U Scheda tecnica(PDF) 11 Page - Sitronix Technology Co., Ltd. |
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ST2205U Scheda tecnica(HTML) 11 Page - Sitronix Technology Co., Ltd. |
11 / 32 page ST2205U Version 1.0 10/32 6/13/2007 8 8.. C CH HIIP P--S SE EL LE EC CT T L LO OG GIIC C ((C CS SL L)) The ST2205U builds in one chip-select signal ( CS0 ) for embedded 16K bytes mask ROM and six chip-select signals multiplexed with PD5~0 of Port-D which are used to select devices on the external bus. There are two options for the first 16K bytes memory which are controlled by MMD pin. Tie MMD to ground to select normal mode and enable internal ROM for the first 16K 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. Chip-select signal CS6 can change 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 |
Codice articolo simile - ST2205U |
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Descrizione simile - ST2205U |
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