The monitor device switches the power supply of the

SRAM from the standard 5V to the battery if the 5V supply

drops below the battery monitor device threshold level.

Any active access to the SRAM at this point is executed

correctly within 1.5µs. After this time any further accesses

to the SRAM are not possible.

A miniature DIP switch allows the selection of the battery

backup source either from the on board lithium cell or from

an external battery via the P14 I/O connector.

The TPMC917-10R provides four RS232 channels. Each

channel has a programmable baud rate up to 115.2Kbaud.

The 4 channel UART provides a 64Byte transmit FIFO and

a 64Byte receive FIFO for each channel to significantly

reduce the overhead required to provide data to and get

data from the transmitter and the receiver. The FIFO

trigger levels are programmable. The channels are ESD

protected up to +/-15kV according to the human body

model and IEC1000-4-2.