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UPD9930 Datasheet(PDF) 18 Page - NEC

Part # UPD9930
Description  LINEAR CODEC FOR DIGITAL CELLULAR TELEPHONE
PDF  78 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD9930 Datasheet(HTML) 18 Page - NEC

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µPD9930
18
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
MCLK
MDAT
MSTR
Microcontroller
PD9930
Microcontroller I/F
MDAT
MCLK
MSTR
Serial I/O
SCK
SO
PORT
µ
2.1.7 Microcontroller Interface
The
µPD9930 can control internal functions by microcontroller command. A clock synchronous serial I/O is
incorporated to receive command.
A clocked serial interface is provided to receive microcontroller commands. A microcontroller connection
example is shown in Figure 2-9. 8-bit length data is received by the serial clock (MCLK), serial input (MDAT),
and strobe input (MSTR) linesNote.
The timing chart is shown in Figure 2-10. By reading data to the internal shift register and setting MSTR
to high level at the MCLK rising point, it is latched to the internal control register. Data transfer must be made
with LSB first.
Note When 8 bits or more (9 MCLK clocks or more) data is input, the last 8-bit which is input immediately before
the active edge of MSTR is recognized as a control command.
Figure 2-9 Example of Connection with Microcontroller
Figure 2-10 Microcontroller Interface Timing Chart



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