Z89C00

The Z89C00 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 1 Kbyte of on-chip data RAM (two blocks of 256 16-bit words), 4K words of program ROM and 64K words of program memory addressing capability. Also, the processor features a 24-bit ALU, a 16 x 16 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.

There is a 16-bit address and a 16-bit data bus for external program memory and data, and a 16-bit I/O bus for transferring data. Additionally, there are two general purpose user inputs and two user outputs. Operation with slow peripherals is accomplished with a ready input pin.  The clock may be stopped to conserve power.

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.

To assist the user in understanding the Z89C00 DSP Q15 two's complement fractional multiplication, an application note has been included in this product specification as an appendix.