MSP53C691 Datasheet, PDF (7/14 Pages) Texas Instruments – MIXED-SIGNAL PROCESSOR

read operation by the master (continued)
a) Sequence of events for a single read operation:
OUTRDY
R/W
STROBE
DATA
COMMAND/DATA
MSP53C691
MIXED-SIGNAL PROCESSOR
SPSS030A – DECEMBER 2000 – REVISED FEBRUARY 2001
b) Read—Two speech data transfer sequences:
OUTRDY
R/W
STROBE
DATA
COMMAND/DATA
Figure 3. Data Transfer – Read
write operation by the master
The process for the write operation by the master is the same in either 4-bit or 8-bit mode. The write operation
by the master happens when the slave is ready to request data or command from the master. The write process
is initiated by the slave by pulling INRDY low when the slave is ready to receive data.
The following events take place during the write operation:
D The MSP53C691 sets INRDY low to indicate that it is ready to receive data from the microcontroller.
D The microcontroller sets R/W low to indicate a write operation.
D The microcontroller puts the data in the external data-bus.
D The microcontroller sets STROBE low after the data is valid.
D The microcontroller sets STROBE high after a minimum of 300 ns. The MSP53C691 also pulls INRDY high
at the rising edge of STROBE.
D The data is latched in the MSP53C691 at the rising edge of STROBE.
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