R01UH0823EJ0100 Rev.1.00 Page 1436 of 1823
Jul 31, 2019
RX23W Group 40. SD Host Interface (SDHIa)
40.2.11 Transfer Data Size Register (SDSIZE)
Note 1. Do not rewrite these bits when the SDSTS2.CBSY flag is 1.
The SDSIZE register is used to set the transfer data size.
LEN[9:0] Bits (Transfer Data Size Setting)
When using single block transfer, the transfer data size can be set from 1 byte to 512 bytes. When CMD12 is
automatically issued during a multi-block transfer sequence (CMD18 and CMD25), the transfer data size can only be set
to 512 bytes. When CMD12 is not automatically issued during a multi-block transfer sequence, the transfer data size can
be set to 32, 64, 128, 256, or 512 bytes. However, a 32-, 64-, 128-, or 256-byte multi-block read transfer can only be
performed during an SDIO multi-block transfer (CMD53). Do not set these bits to 0 when using a command that includes
data transfer.
SDSIZE
Address(es): SDHI.SDSIZE 0008 AC4Ch
b31 b30 b29 b28 b27 b26 b25 b24 b23 b22 b21 b20 b19 b18 b17 b16 b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
— — — — — — — — — — — — — — — — — — — — — — LEN[9:0]
Value after reset:
00000000000000000000001000000000
Bit Symbol Bit Name Description R/W
b9 to b0 LEN[9:0] Transfer Data Size Setting Set the transfer data size.
*1
R/W
b11 to b10 — Reserved These bits are 0 when read. Set them to 0 when writing. R
b31 to b12 — Reserved These bits are 0 when read and cannot be modified. R
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