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UPD9971 Datasheet(PDF) 28 Page - Renesas Technology Corp

Part # UPD9971
Description  MOS INTEGRATED CIRCUIT
PDF  112 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD9971 Datasheet(HTML) 28 Page - Renesas Technology Corp

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µPD9971
Data Sheet S17455EJ2V0DS
26
3.2.3 Access formats (3-wire SPI mode)
Figure 3-5 Host CPU Access (During Write/Read Access)
SCS
SCLK
Data
Hi-Z
Hi-Z
8 bits
8 bits
R/W
A6
A1
A0
D7
D6
D1
D0
Figure 3-6 Host CPU Access Formats (Continuous Access)
(a) Write Access
SCS
SCLK
Data
Hi-Z
Hi-Z
Hi-Z
R/W
A0
D7
D0
R/W
A0
D7
D0
Access1
Access2
(b) Read Access
SCS
SCLK
Data
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
R/W
A0
D7
D0
R/W
A0
D7
D0
Access1
Access2
From CPU
To CPU
From CPU
To CPU
Remark
The above formats are used except when accessing FIFOs in the sound generator block.



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