TMPM330 - Keil

(2) ACK error
Under development
TMPM330 (rev0.4)11-34
TMPM330
An ACK error interrupt occurs when an ACK response does not conform to the configuration
specified in the CECTCR bit.
When the ACK error interrupt occurs, the CECTSTAT bit is set.
The ACK error is detected in the following cases.
Configuration Determined as an ACK error when
=0
Broadcast transmission?: No
ACK response is logical “1”
=1
Broadcast transmission?: Yes
ACK response is logical “0”
(3) Transmit Buffer Underrun
A transmit buffer underrun error is caused by the following sequence.
1. Data in the transmit buffer is transmit to the shift register.
2. An interrupt occurs.
3. A byte of data is transmitted.
4. No data is set to the transmit buffer before starting transmission of a byte of subsequent data.
When an underrun error occurs, the CECTSTAT bit is set.
(4) Order of ACK Error and Transmit Buffer Overrun
If interrupt factors of the ACK error and transmit buffer underrun are detected at the end of
transmission of a byte of data, the transmit buffer underrun has priority. The transmit buffer underrun
interrupt occurs first and then the ACK error interrupt occurs.
11.3.2.8 Stopping Transmission
To stop transmission, send data including the EOM bit that indicates “1”. This generates a transmit
completion interrupt.
Please note that proper operation is not ensured if the start bit of transmission is set to “0” during
transmission.
11.3.2.9 Retransmission
Transmission is stopped by error detection. To retry the transmission, configure the condition and
data of starting the transmission.
CEC