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UPD9971 Datasheet(PDF) 30 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) 30 Page - Renesas Technology Corp

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µPD9971
Data Sheet S17455EJ2V0DS
28
3.2.4 Access formats (4-wire SPI mode)
Figure 3-8 Host CPU Access Format (Read/Write Access)
SCLK
SCS
R/W
A6
A1
A0
RXD
D7
D6
D1
D0
TXD
8 bits
8 bits
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Figure 3-9 Host CPU Access Formats (Continuous Access)
(a) Write access
SCLK
SCS
Hi-Z
RXD
R/W
A0
R/W
A0
D7
D0
TXD
D7
D0
Hi-Z
Hi-Z
Hi-Z
Access1
Access2
(b) Read access
D7
TXD
SCLK
SCS
D0
D7
D0
R/W
A0
A0
RXD
Hi-Z
From CPU
Access 1
Hi-Z
Hi-Z
Hi-Z
Hi-Z
R/W
To CPU
Hi-Z
From CPU
To CPU
Access 2
Remark
The above formats are used except when accessing FIFOs in the sound generator.



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