20-26
MC9328MX1 Reference Manual
MOTOROLA
Multimedia Card/Secure Digital Host Controller Module (MMC/SD)
20.6.10 MMC/SD Interrupt Mask Register
When certain conditions exist in the module, the MMC/SD module has the ability to set an interrupt. The
MMC/SD Interrupt Mask Register allows the user to control whether these interrupts occur.
Rewriting this register clears the interrupt MMC_IRQ. When the interrupt source is from the SD I/O, the
MMC/SD module continues to interrupt the system. In this case, the user must write to the internal
registers on the SD I/O card. This is the only way to acknowledge the interrupt. In the interrupt service
routine the status indicators should be polled.
INT_MASK
MMC/SD Interrupt Mask Register
Addr
0x00214024
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AUTO_
CARD_
DETECT
DAT0
_EN
SDIO
BUF_
READY
END_
CMD_
RES
WRITE
_OP_
DONE
DATA_
TRAN
TYPE
r
r
r
r
r
r
r
r
r
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 20-14. MMC/SD Interrupt Mask Register Description
Name
Description
Settings
Reserved
Bits 31–7
Reserved—These bits are reserved and should read 0.
AUTO_CARD_DETECT
Bit 6
Auto Card Detect (SD card only)
—Masks the
auto card detect interrupt. Card insertion results in
the SD_DAT [3:0] pins changing from
0111
to
1111
, and card removal results in the pins
changing from
1111
to
0111
. After the card is
detected, the user program must mask
AUTO_CARD_DETECT to avoid misleading
interrupt generation while the SD_DAT lines
change during card access.
0 = Not masked
1 = Masked
DAT0_EN
Bit 5
SD_DAT0 Enable
—Identifies how the SD I/O
interrupt is detected. An interrupt is determined by
SD_DAT [1] = 0, however this bit is an optional
setting for the SDIO bit.
0 = SD I/O’s Interrupt detection
based on SD_DAT [3:1] =
110
1 = SD I/O’s Interrupt detection
based on SD_DAT [3:0] =
1101
SDIO
Bit 4
MMC/SD I/O
—Masks the interrupt from the SD I/O
card to the MMC/SD module I/O interrupt mask.
0 = Not masked
1 = Masked
Summary of Contents for DragonBall MC9328MX1
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Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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