at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 202

• Manufacturer Part Number: at85c51snd3
• Description: At85c51snd3 Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Interrupt
202
AT85C51SND3B
Figure 96. SD Card Write Protection Input Block Diagram
As shown in Figure 97, the MMC controller implements eight interrupt sources reported
in CDETI, EORI, EOCI, EOFI, WFRI, HFRI and EOBI flags in MMCINT register. These
flags are detailed in the previous sections.
All these sources are maskable separately using CDETM, EORM, EOCM, EOFM,
WFRM, HFRM and EOBM mask bits respectively in MMMSK register.
The interrupt request is generated each time an unmasked flag is set, and the global
MMC controller interrupt enable bit is set (EMMC in IEN1 register).
Reading the MMINT register automatically clears the interrupt flags (acknowledgment).
This implies that register content must be saved, and tested flag by flag to be sure not to
forget any interrupts.
Figure 97. MMC Controller Interrupt System
MMINT.7
MMINT.6
MMINT.5
MMINT.4
MMINT.3
MMINT.2
MMINT.1
CDETI
WFRI
EORI
EOCI
EOBI
EOFI
HFRI
MMMSK.6
MMMSK.4
MMMSK.2
EORM
EOFM
HFRM
SDLCK
MMMSK.7
MMMSK.5
MMMSK.3
MMMSK.1
CDETM
WFRM
EOCM
EOBM
IOVDD
R
PU
MMSTA.7
SDWP
EMMC
IEN1.5
7632D–MP3–01/07
MMC
Interrupt
Request