Z89320

The Z89320 is a second generation, 16-bit fractional, two's complement CMOS Digital Signal Processor (DSP). Most  instructions, including multiply and accumulate, are accomplished in a single clock cycle. The processor contains 1Kbyte of on-chip data RAM (two blocks of 256 16-bit words), 4K words of program ROM. Also, the processor features a 24-bit ALU, a 16x16 multiplier, a 24- bit Accumulator and a shifter. Additionally, the processor contains a six-level stack, three vectored interrupts and two inputs for conditional program jumps. Each RAM block contains a set of three pointers which may be incremented or decremented automatically to affect hardware looping without software overhead. The data RAMs can be simultaneously addressed and loaded to the multiplier for a true single cycle multiply.

The Z89320 includes a 16-bit I/O bus for transferring data or for mapping peripherals into the processor address space. Additionally, there are two general purpose user inputs and two user outputs. Operation with slow peripherls is accompished with a ready input pin.

Development tools for the IBM PC include a relocatable assembler, a linker loader, and an ANSI-C compiler. Also, the development tools include a simulator/debugger, a cross assembler for the TMS320 family assembly code and a hardware emulator.