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NEC μPD77C25 was succeeded by backwards compatible μPD96050 which runs at either 10 or 15 MHz frequency with 2,048 16-bit data RAM, 2,048-word 16-bit data ROM, and 16,384-word 24-bit program memory. Compared to its predecessor, call stack has been expanded to depth of 8, instruction set includes some
78:
International Solid-State
Circuits conference. The μPD7720 first became available in 1981 and commercially available in late 1982 at a cost of ¥20.000 (around $ 82 and inflation corrected for 2023 dollars around $ 304). Beyond their initial use in telephony, these processors found applications in
128:
The NEC μPD77C25, which succeeded the μPD7720, runs at 8 MHz frequency with 256-word 16-bit data RAM, 1,024-word 16-bit data ROM, and 2,048-word 24-bit program memory. The stack, utilized during subroutine calls and interrupts, maintains the same depth of four as that of the μPD7720.
70:, an integrated processor that, while it had both digital-to-analog and analog-to-digital converters, lacked additional features (such as a hardware multiplier) that would be found in later processors. Announcements for the first "real" DSPs, the NEC μPD7720 and the Bell Labs
87:
Detailed descriptions of the μPD7720 architecture are found in Chance (1990), Sweitzer (1984) and
Simpson (1984). Briefly, the NEC μPD7720 runs at 4 MHz frequency with 128-word 16-bit data RAM, 512-word 13-bit data ROM, and 512-word 23-bit program memory, which has
61:
In the late 1970s, telephone engineers were attempting to create technology with sufficient performance to enable digital touch-tone dialing. Existing digital signal processing solutions required over a hundred chips and consumed significant amounts of power.
100:
operation, address register increment/decrement operation, and move operation in one cycle. The stack area, which is distinct from the main memory address space, is allocated in a separate address space. The stack, utilized during
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Simpson, Robert J.; Terrell, Trevor J. (September 1984). "Digital filtering using the NEC μPD7720 signal processor".
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ICASSP '84. IEEE International
Conference on Acoustics, Speech, and Signal Processing
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Both μPD77C25 (DSP-1, DSP-2, DSP-3, DSP-4) and μPD96050 (ST010, ST011) were used as
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Datasheets for the UPD77C25C, UPD77C25GW and UPD77C25L are available
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additional instructions and it supports battery backup for data RAM.
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117:
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Datasheets for the UPD7720A, UPD7720AC and UPD7720AD are available
324:
Introduction to
Embedded Systems: A Cyber-physical Systems Approach
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disk drive and graphics controllers, speech synthesis and modems.
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Digital Signal
Processing: Principles, Devices and Applications
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Sweitzer, S. (March 1984). "A low cost FFT chip set".
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Lee, Edward
Ashford; Seshia, Sanjit Arunkumar (2011).
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responded to this potential market by introducing the
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enhancement coprocessors in Super NES game cartridges
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459:"μPD77C20A, 7720A, 77P20 Digital Signal Processor"
438:"μPD77C20A, 7720A, 77P20 Digital Signal Processor"
46:). Announced in 1980, it became, along with the
197:Communication System Design Using DSP Algorithms
356:. In Jones, N. B.; Watson, J. D. McK. (eds.).
74:chip, occurred the following year at the 1980
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483:"μPD77C25/μPD77P25 Digital Signal Processor"
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53:, one of the most popular DSPs of its day.
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360:. Peter Peregrinus Ltd. pp. 10–12.
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409:Microprocessing and Microprogramming
244:Nanocomputers and Swarm Intelligence
275:. Chapman & Hall. p. 365.
272:Foundations of Computer Technology
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385:. Vol. 9. pp. 371–373.
269:Anderson, Alexander John (1994).
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241:Waldner, Jean-Baptsite (2007).
158:Hays, W. Patrick (March 2004).
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297:"Milestones:MPD7720DSP, 1980"
421:10.1016/0165-6074(84)90101-7
327:. Lee & Seshia. p.
761:NEC Philips Unified Systems
737:Sharp NEC Display Solutions
391:10.1109/ICASSP.1984.1172726
194:Tretter, Steven A. (2008).
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716:Japan Aviation Electronics
575:NEC Corporation of America
160:"DSPs: Back to the Future"
1161:Digital signal processors
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756:NEC Mobile Communications
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36:digital signal processors
655:Reveal Computer Products
580:NEC Laboratories America
96:format, enabling all of
597:NEC Solution Innovators
426:(subscription required)
396:(subscription required)
200:. Springer. p. 2.
183:(subscription required)
109:, has a depth of four.
883:Walter Tenney Carleton
585:NEC Software Solutions
352:Chance, R. J. (1990).
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612:Netcracker Technology
602:NEC Unified Solutions
247:. Wiley. p. 93.
177:10.1145/984458.984485
120:
1156:NEC microprocessors
1066:Renesas Electronics
1024:Video game consoles
867:Video game consoles
729:Renesas Electronics
660:Zenith Data Systems
44:Renesas Electronics
857:Personal computers
779:Products, services
684:Joint ventures and
354:"Devices Overview"
207:978-0-387--74885-6
126:
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940:NEC Green Rockets
893:Tadahiro Sekimoto
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461:. p. 4(3a-4)
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254:978-1-84821-009-7
48:Texas Instruments
16:(Redirected from
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415:(2): 67–78.
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123:NEC μPD96050
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83:Architecture
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26:
955:NEC Shun-Ei
798:μCOM series
724:NEC BIGLOBE
640:NEC BIGLOBE
485:. p. 1
440:. p. 1
94:instruction
42:(currently
33:fixed point
18:NEC µPD7720
1150:Categories
489:2023-12-18
465:2023-12-25
444:2023-12-18
367:0863412106
307:2023-08-03
227:2024-01-14
222:"The 2920"
142:References
107:interrupts
105:calls and
103:subroutine
68:Intel 2920
57:Background
1014:Computers
170:(1): 44.
1115:R8C Tiny
1073:Products
991:Category
113:Variants
51:TMS32010
27:The NEC
1003:Commons
808:µPD7720
803:µPD7220
749:Defunct
708:Anritsu
693:Current
633:Defunct
568:Current
29:μPD7720
1095:SuperH
902:Places
876:People
619:Avaloq
607:Avaloq
364:
335:
279:
251:
204:
92:-like
1135:IEBus
1090:RH850
918:Other
850:N343i
813:R4200
740:(34%)
732:(34%)
719:(25%)
703:(40%)
164:Queue
72:DSP-1
64:Intel
38:from
1120:M32R
1100:V850
1080:RL78
978:Sold
845:e616
833:V850
711:(7%)
515:here
508:here
362:ISBN
333:ISBN
301:ETHW
277:ISBN
249:ISBN
202:ISBN
90:VLIW
76:IEEE
1130:740
1110:R8C
1105:78K
828:V60
823:V25
818:V20
793:78K
624:KMD
552:NEC
417:doi
387:doi
329:182
172:doi
98:ALU
40:NEC
1152::
1125:H8
1085:RX
590:UK
474:^
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
