Z86C93

The Z86C93 is a CMOS ROMless Z8 microcontroller enhanced with a hardwired 16-bit x 16-bit multiplier,32-bit/16-bit divider, and three 16-bit counter timers (see Functional Block Diagram). A capture register and a fast decrement mode are also provided. It is offered in 40-pin PDIP, 44-pin PLCC, 44-pin QFP, and 48-pin VQFP packages.The Z86C93 is functionally compatible with the Z86C91, yet it offers a more powerful mathematical capability.In the PDIP package, the Z86C93 is fully pin compatible with the Z86C91. In the PLCC package, the Z86C93 is also pin compatible to the Z86C91, with the addition of four signals (SCLK, /IACK, /SYNC, and /WAIT). The /WAIT signal is only available on the 25 MHz and 33 MHz devices.

The Z86C93 provides up to 16 output address lines permitting an address space of up to 64 Kbytes of data and program memory each. Eight address outputs (AD7-AD0) are provided by a multiplexed, 8-bit, Address/Data bus.The remaining 8 bits can be provided by the software configuration of Port 0 to output address bits A15-A8.

There are 256 registers located on chip and organized as 236 general-purpose registers, 16 control and status registers,one reserved register, and up to three I/O port registers. The register file can be divided into 16 groups of 16 working registers each. Configuration of the registers in this manner allows the use of short format instructions; in addition, any of the individual registers can be accessed directly. There are an additional 17 registers implemented
in the Expanded Register File in Banks D and E. Two of the registers may be used as general-purpose registers, while 15 registers supply the data and control functions for the Multiply/Divide Unit and additional Counter/Timer blocks.