TMPM330 - Keil

SCL pin
Write to SBIxDBR
SDA pin
INTS0 interrupt
request
SCL
SDA
INTSBIx interrupt request
INTSBIx interrupt
Under development
if MST = 0
Then go to the slave-mode processing
if TRX = 0
Then go to the receiver-mode processing
if LRB = 0
Then go to processing for generating the stop condition
TMPM330 (rev 0.4) 10-21
TMPM330
SBIxCR1 ← X X X X 0 X X X Specifies the number of bits to be transmitted and specify
whether ACK is required.
SBIxDBR ← X X X X X X X X Writes the transmit data.
End of interrupt processing
(Note) X: Don’t care
1
D7
Fig. 10-15 = “000” and = “1” (Transmitter Mode)
Receiver mode ( = “0”)
2 3 4 5 6 7 8 9
D6 D5 D4 D3 D2 D1
If the next data to be transmitted has eight bits, the transmit data is written into SBIxDBR. If
the data has different length, and are programmed and the received data
is read from SBIxDBR to release the SCL line. (The data read immediately after
transmission of a slave address is undefined.) On reading the data, is set to “1,” and
the serial clock is output to the SCL pin to transfer the next data word. In the last bit, when
the acknowledgment signal becomes the “L” level, “0” is output to the SDA pin.
After that, the INTSBIx interrupt request is generated, and is cleared to “0,” pulling
the SCL pin to the “L” level. Each time the received data is read from SBIxDBR, one-word
transfer clock and an acknowledgement signal are output.
Read the received data
1
D7
Fig. 10-16 = “000” and = “1” (Receiver Mode)
D0
ACK
2 3 4 5 6 7 8 9
D6 D5 D4 D3 D2 D1
D0
Master output
Slave output
ACK
Acknowledgment signal
from receiver
Master output
Slave output
Next D7
Acknowledgment
signal from receiver
Serial Bus Interface (SBI)