R01UH0823EJ0100 Rev.1.00 Page 1442 of 1823
Jul 31, 2019
RX23W Group 40. SD Host Interface (SDHIa)
40.2.17 SDIO Status Register (SDIOSTS)
Note 1. The flag value does not change even when set to 1. If 0 is written to this flag, it becomes 0.
The SDIOSTS register indicates the status of the SDIO card access. When clearing a flag, bits to be cleared should be set
to 0; bits not being cleared should be set to 1.
IOIRQ Flag (SDIO Interrupt Status Flag)
— This flag becomes 1 under the following condition:
The SDIO interrupt from the SDIO card is accepted while the SDIOMD.INTEN bit is 1.
— This flag becomes 0 under the following condition:
The flag is set to 0.
*1
Note 1. Access the SDIO card, negate the SDIO interrupt from the SDIO card, and then set the IOIRQ flag to 0. If the
SDIO interrupt from the SDIO card is not negated, the IOIRQ flag might become 1 again.
EXPUB52 Flag (EXPUB52 Status Flag)
— This flag becomes 1 under any of the following conditions:
When multi-block transfer is triggered by CMD53 being issued, the SDIOMD.C52PUB bit is set to 1 while the last
block is being transferred.
When multi-block write is triggered by CMD53 being issued, the SDIOMD.C52PUB bit remains set to 1 while the
last block is being transferred.
— This flag becomes 0 under the following condition:
The flag is set to 0.
SDIOSTS
Address(es): SDHI.SDIOSTS 0008 AC6Ch
b31 b30 b29 b28 b27 b26 b25 b24
— — — — — — — —
Value after reset:
00000000
b23 b22 b21 b20 b19 b18 b17 b16
— — — — — — — —
Value after reset:
00000000
b15 b14 b13 b12 b11 b10 b9 b8
EXWT EXPUB52 — — — — — —
Value after reset:
00000000
b7 b6 b5 b4 b3 b2 b1 b0
— — — — — — —IOIRQ
Value after reset:
00000000
Bit Symbol Bit Name Description R/W
b0 IOIRQ SDIO Interrupt Status Flag
0: SDIO interrupt not accepted
1: SDIO interrupt accepted
R/(W)
*1
b2, b1 — Reserved These bits are undefined when read. Set them to 1 when writing. R/W
b13 to b3 — Reserved These bits are 0 when read and cannot be modified. R
b14 EXPUB52 EXPUB52 Status Flag Indicates the status of the EXPUB52
R/(W)
*1
b15 EXWT EXWT Status Flag Indicates the status of the EXWT
R/(W)
*1
b31 to b16 — Reserved These bits are 0 when read and cannot be modified. R
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