Mmc/Sd Interrupt Mask Register; Table 20-14 Mmc/Sd Interrupt Mask Register Description - Motorola DragonBall MC9328MX1 Reference Manual

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
BIT 31 30 29
TYPE r r r
0 0 0
RESET
BIT 15 14 13
TYPE r r r
0 0 0
RESET
Table 20-14. MMC/SD Interrupt Mask Register Description
Name
Reserved
Bits 31–7
AUTO_CARD_DETECT
Bit 6
DAT0_EN
Bit 5
SDIO
Bit 4
20-26
MMC/SD Interrupt Mask Register
28 27 26 25 24 23
r r r r r r
0 0 0 0 0 0
12 11 10 9 8 7
r r r r r r
0 0 0 0 0 0
Description
Reserved—These bits are reserved and should read 0.
Auto Card Detect (SD card only)—Masks the
auto card detect interrupt. Card insertion results in
the SD_DAT [3:0] pins changing from
, and card removal results in the pins
1111
changing from 1111 to 0111
detected, the user program must mask
AUTO_CARD_DETECT to avoid misleading
interrupt generation while the SD_DAT lines
change during card access.
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.
MMC/SD I/O—Masks the interrupt from the SD I/O
card to the MMC/SD module I/O interrupt mask.
MC9328MX1 Reference Manual
22 21 20
r r r
0 0 0
0x0000
6 5 4
AUTO_
DAT0
CARD_ SDIO
_EN
DETECT
rw rw rw
0 0 0
0x0000
0 = Not masked
1 = Masked
0111 to
. After the card is
0 = SD I/O's Interrupt detection
1 = SD I/O's Interrupt detection
0 = Not masked
1 = Masked
Addr
0x00214024
19 18 17
r r r
0 0 0
3 2 1
END_ WRITE
BUF_ DATA_
CMD_ _OP_
READY TRAN
RES DONE
rw rw rw
0 0 0
Settings
based on SD_DAT [3:1] =
110
based on SD_DAT [3:0] =
1101
MOTOROLA
16
r
0
0
rw
0