R01UH0823EJ0100 Rev.1.00
Page 394 of 1823
Jul 31, 2019
RX23W Group
19. Data Transfer Controller (DTCa)
19.4.2
Transfer Information Write-Back Skip Function
When the MRA.SM[1:0] bits or the MRB.DM[1:0] bits are set to “address is fixed” (00b or 01b), a part of transfer
information is not written back. This function is performed independently of the setting of short-address mode or full-
address mode.
lists transfer information write-back skip conditions and applicable registers. The CRA and CRB registers
are written back independently of the setting of short-address mode or full-address mode.
Furthermore, in full-address mode, write-back of registers MRA and MRB is skipped.
Table 19.4
Transfer Information Write-Back Skip Conditions and Applicable Registers
SAR Register
DAR Register
b3
b2
b3
b2
0
0
0
0
Skip
Skip
0
0
0
1
0
1
0
0
0
1
0
1
0
0
1
0
Skip
Write-back
0
0
1
1
0
1
1
0
0
1
1
1
1
0
0
0
Write-back
Skip
1
0
0
1
1
1
0
0
1
1
0
1
1
0
1
0
Write-back
Write-back
1
0
1
1
1
1
1
0
1
1
1
1