UPD780 - NEC

UPD780 8-BIT N-CHANNEL MICROPROCESSOR

NEe Microcomputers, Inc. NEe J.L PD780 J.L PD780·1 8·BIT N·CHANNEL MICROPROCESSOR COMPLETELY Z80™ COMPATIBLE DESC RIPTI ON The pPD780 and pPD780-1 processors are single-chip microprocessors developed from third-generation technology,Their increased computational power produces higher system through-put and more efficient memory utilization, surpassing th.

Features

ually as S-bit registers, or as 6-bit register pairs. Also included are two sets of accumulator and flag registers. Through a group of exchange instructions the programmer has access to either set of main or alternate registers. The alternate register permits foreground/background mode of operation, or may be u~ed fv( fast interrupt response. A l6-bit stack pointer is also included in each processor, simplifying implementation of multiple level interrupts, permitting unlimited subroutine nesting, and simplifying many types of data handling. The two 16-bit index registers simplify implementatio.