NEC UPD77P25
The uP077C25/uP077P25 signal processing interface (SPI) chips are significant upgrades to the uP07720 - the original member of NEC's family of digital signal processors.| Part No. | UPD77P25 |
|---|---|
| Datasheet | UPD77P25 Download |
| Manufacturer |  NEC |
| Description | Digital Signal Processor |
| Buy | Stock & Price |
DESCRIPTION
Oesignated the "SPI PLUS" (SPI+), these chips execute instructions twice as fast as the 7720/77C20. Additional instructions allow the SPI+ to execute common digital filter routines more efficiently and hence at more than twice the speed of a 7720 implementation. 1n addition to doubled execution speed, the SPI+ has four times the .instruction ROM space anel twice the data ROM and RAM space of the n20. Real savings are now possible especially where one nC25 can do the wori< of - and replace two or more 7720s. The externai clock frequency (8.3 MHz maximum) remains the same as for n20/77C20 while the internai instruction -execution speed is doubled. For most applications, the 77C25177P25 is plug-in compatible with the n20177C20177P20. The feature that distinguishes digital signal processing (OSP) chips from general-purpose microcomputers is the onchip multiplier● necessary for high speed signal processing algorithms. The SPI+ multiplier is very sophisticated especially for a Iow-cost OSP chip
● since both multiplier inputs can be Ioaded simultaneously from two separate memory areas.
