Protean Logic Peripheral ICs
Protean Logic has applied our firmware
development skills to produce some specially programmed controllers that
serve very specific needs. These devices have a fixed purpose and are,
generally speaking, not programmable. By using these inexpensive ICs, the
real-time burden, or I/O burden of the host processor can be drastically
The following is a list of
peripheral processor ICs currently available:
Xtender73 - A 28 pin IC that
provides 8 additional I/O lines, implements RS232, PWM, etc. It is
connected to the host via an I2C connection. In the case of a TICkit host,
it can use the EEprom I2C bus, thus requiring no I/O lines to interface. A
19.6608 MHz Xtal is required.
RSB509 - A 8 pin IC that buffers
RS232 serial input data up to 32 characters. This device allows single
thread host processors, like Parallax's BASIC STAMP to receive serial data
in background. A 4.00 MHz Xtal is required.
RSB6505 - A 14 pin IC that buffers
RS232 serial input data up to 64 characters. This device can be cascaded
for larger buffers and can buffer input data up to 38,400 baud. This
device implements hardware handshake and support network packet modes.
This serial buffer implements special line buffering modes which work
especially well with Parallax's BASIC STAMP SERIN command. A 19.6608 MHz
xtal is required.