Product data

When, with the I

C bus format selected, IRIC is set to 1 and an interrupt is generated, other flags

must be checked in order to identify the source that set IRIC to 1. Although each source has a

corresponding flag, caution is needed at the end of a transfer.

When the TDRE or RDRF internal flag is set, the readable IRTR flag may or may not be set. The

IRTR flag (the DTC start request flag) is not set at the end of a data transfer up to detection of a

retransmission start condition or stop condition after a slave address (SVA) or general call address

match in I

C bus format slave mode.

Even when the IRIC flag and IRTR flag are set, the TDRE or RDRF internal flag may not be set.

The IRIC and IRTR flags are not cleared at the end of the specified number of transfers in

continuous transfer using the DTC. The TDRE or RDRF flag is cleared, however, since the

specified number of ICDR reads or writes have been completed.

Table 16.3 shows the relationship between the flags and the transfer states.

Table 16.3 Flags and Transfer States

MST TRS BBSY ESTP STOP IRTR AASX AL AAS ADZ ACKB State

1/01/0000000000 Idle state (flag

clearing required)

11000000000 Start condition

issuance

11100100000 Start condition

established

11/0100000000/1Master mode wait

11/0100100000/1Master mode

transmit/receive end

0010001/011/01/00 Arbitration lost

00100000100 SAR match by first

frame in slave mode

00100000110 General call

address match

00100010000 SARX match

01/0100000000/1Slave mode

transmit/receive end

(except after SARX

match)

1/0

Slave mode

transmit/receive end

(after SARX match)

0 1/0 0 1/0 1/0 0 0 0 0 0 0/1 Stop condition

detected