TMPM330 - Keil

SCL
SDA
INTSBIx interrupt
request
Under development
TMPM330 (rev 0.4) 10-22
TMPM330
To terminate the data transmission from the transmitter, must be set to “0”
immediately before reading the data word second to last. This disables generation of an
acknowledgment clock for the last data word. When the transfer is completed, an interrupt
request is generated. After the interrupt processing, must be set to “001” and the
data must be read so that a clock is generated for 1-bit transfer. At this time, the master
receiver holds the SDA bus line at the “H” level, which signals the end of transfer to the
transmitter as an acknowledgment signal.
In the interrupt processing for terminating the reception of 1-bit data, the stop condition is
generated to terminate the data transfer.
9
1
D7 D6 D5 D4 D3 D2 D1 D0
Acknowledgment signal
to transmitter “H”
Fig. 10-17 Terminating Data Transmission in the Master Receiver Mode
Example: When receiving N data word
INTSBIx interrupt (after data transmission)
SBIxCR1
7 6 5 4 3 2 1 0
← X X X X 0 X X X Sets the number of bits of data to be received and
specify whether ACK is required.
Reg. ← SBI0DBR Reads dummy data.
End of interrupt
INTSBIx interrupt (first to (N-2)th data reception)
7 6 5 4 3 2 1 0
Reg. ← SBIxDBR Reads the first to (N-2)th data words.
End of interrupt
INTSBIx interrupt ((N-1)th data reception)
SBIxCR1
7 6 5 4 3 2 1 0
← X X X 0 0 X X X Disables generation of acknowledgement clock.
Reg. ← SBIxDBR Reads the (N-1)th data word.
End of interrupt
INTSBIx interrupt (Nth data reception)
7 6 5 4 3 2 1 0
SBIxCR1 ← 0 0 1 0 0 X X X Disables generation of acknowledgement clock.
Reg. ← SBIxDBR Reads the Nth data word.
End of interrupt
INTSBIx interrupt (after completing data reception)
Processing to generate the stop condition. Terminates the data transmission.
End of interrupt
2 3 4 5 6 7 8 1
Read out the received data after clearing to "0”.
(Note) X: Don’t care
Read out the received
data after setting
to "001."
Master output
Slave output
Serial Bus Interface (SBI)