UPD77P25
Description
The u P077C25/u P077P25 signal processing interface (SPI) chips are significant upgrades to the u P07720
- the original member of NEC's family of digital signal processors. Oesignated the "SPI PLUS" (SPI+), these chips execute instructions twice as fast as the 7720/77C20. Additional instructions allow the SPI+ to execute mon 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 n C25 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 patible with the n20177C20177P20.
The feature that distinguishes digital signal processing (OSP) chips from...
