TP3464

The TP3464 MICROWIRE Interface Device can used in a number of ripheral devices that applications involving MICROWIRE need to be controlled using a standard microprocessor which only has a parallel bus structure.The TP3464 is designed for (1)ISDN terminal adapters; (2)digital line cards(ISDN and non ISDN); (3)analog linecards using national COMBO II; (4)interfacing to industry standard serial EEPROMs; (5)interfacing to industry standard MICROWIRE peripheral devices such as analog to digital converters, LCD drivers, clock generators.

Features of the TP3464 are:(1)multiplexed and non-multiplexed microprocessor bus compatible; (2)national/intel and motorola microprocessor bus compatible; (3)microprocessor Clock (CKIN) up to 20 MHz; (4)MICROWIRE clock speeds up to 5 MHz; (5)directly compatible with 8- and 16-bit MICROWIRE peripherals; (6)TP3464 for 4 chip select outputs (24-pin); (7)memory mapped peripherals; (8)programmable MICROWIRE clock to communicate with devices of different speeds; (9)operates as MICROWIRE bus master or slave; (10)24-pin skinny-DIP pkg or 28-pin PLCC, DIP; (11)CMOS, low power.

The absolute maximum ratings of the TP3464 can be summarized as:(1)Vcc to GND:7V;(2)DC input current:Ii±50mA;(3)lead temperature range:300;(4)storage temperature:-65 to 150;(5)input voltage:-0.3 to Vcc+0.3V.The MICROWIRE serial data bus is often used as a means of inter-processor communication. The MID TP3464 may be used either as the Master of the MICROWIRE clock SK or as a Slave to the SK clock fed via CKIN pin. Figure 6 shows an application in which two general microprocessors communicate with each other over the MICROWIRE bus. At the same time other peripherals are also connected to the serial bus. External handshaking between the two processors is required before the MICROWIRE Byte data transfer is executed by the master of the MICROWIRE bus.Writing to this register will affect the pins (configured as outputs in PD register) directly. Similarly, the state of the pins which are configured as inputs in the PD registers can be Read via the same (CS) register. When reading the pins designated as outputs, the bits of TP3464 will have a "1" condition.Writing to bits corresponding to input pins will have no effect on the pins.