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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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PSD813F2 数据表(PDF) 29 Page - STMicroelectronics |
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PSD813F2 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 110 page  29/110 PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2 SRAM The SRAM is enabled when SRAM Select (RS0) from the DPLD is High. SRAM Select (RS0) can contain up to two product terms, allowing flexible memory mapping. The SRAM can be backed up using an external battery. The external battery should be connected to Voltage Stand-by (VSTBY, PC2). If you have an external battery connected to the PSD, the con- tents of the SRAM are retained in the event of a power loss. The contents of the SRAM are re- tained so long as the battery voltage remains at 2 V or greater. If the supply voltage falls below the battery voltage, an internal power switch-over to the battery occurs. PC4 can be configured as an output that indicates when power is being drawn from the external bat- tery. Battery-on Indicator (VBATON, PC4) is High with the supply voltage falls below the battery volt- age and the battery on Voltage Stand-by (VSTBY, PC2) is supplying power to the internal SRAM. SRAM Select (RS0), Voltage Stand-by (VSTBY, PC2) and Battery-on Indicator (VBATON, PC4) are all configured using PSDsoft Express Configu- ration. |
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