msm7584c Oki Semiconductor, msm7584c Datasheet - Page 17

• Manufacturer Part Number: msm7584c
• Description: Pi /4 Shift Qpsk Modem/adpcm Codec
• Manufacturer: Oki Semiconductor

 
      

 
¡ Semiconductor
(Common)
RESET
Device reset input.
The control registers CR0 to CR22 all are reset to the initial values by setting this pin to "0" level.
R0, R1
Output ports for the control register CR21.
The data written in CR21 - B0 and B1 are output on the R0 and R1 pins.
These pins become high impedance when the device is reset.
DEN, EXCK, DIN DOUT
Serial control ports for the microcontroller interface.
The device has 23 bytes of control registers. Data is written and read by the external CPU using
these ports. DEN is an enable signal input, EXCK is a data shift clock signal input, DIN is an
address/data input, and DOUT is a data output.
The input/output timing is shown in Fig. 6.
The control register map is shown in Table 2.
As shown in Fig. 6, data should be written or read in continuous pulses of the EXCK signal or in
16 bits.
IO1 to IO7
Input/output for internal analog switches.
See the control register map (CR22) and circuit configuration for connection information and
control method.
TOUT1, TOUT2, TOUT3
Sign bit outputs for the tone generator.
The outputs are controlled by the control register CR22. See the control register map and circuit
configuration for connection information and control method.
DEN
DIN
DEN
DIN
EXCK
EXCK
DOUT
High Impedance
W
R
A4
A4
A3
A3
Figure 6 MCU Interface I/O Timing
A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0
A2 A1 A0
(b) Read Data Timing

 
B7 B6 B5 B4 B3 B2 B1 B0
(a) Write Data Timing

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