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Additional System Resources
System resources, some of which are previously listed, provide
additional capability useful to complete systems. Additional
resources include low voltage detection (LVD) and power on
reset (POR). Brief statements describing the merits of each
system resource follow.
■ The I
C slave and SPI master-slave module provides 50, 100,
or 400 kHz communication over two wires. SPI communication
over three or four wires runs at speeds of 46.9 kHz to 3 MHz
(lower for a slower system clock).
■ LVD interrupts signal the application of falling voltage levels,
while the advanced POR circuit eliminates the need for a
■ An internal 1.8-V reference provides an absolute reference for
■ The 5 V maximum input, 3 V fixed output, low dropout regulator
(LDO) provides regulation for I/Os. A register controlled bypass
mode enables the user to disable the LDO.