PSD9342V15UIT 查看數據表（PDF） - STMicroelectronics

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PSD9342V15UIT

Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V

STMicroelectronics 

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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