Figure 19. Interrupt Control System
Highest
Priority
00
01
10
11
External
Interrupts
INT0
Interrupt 0
EX0
IEN0.0
00
01
10
11
Timer 0
ET0
IEN0.1
00
01
10
11
External
Interrupt 1
INT1
EX1
IEN0.2
00
01
10
11
Timer 1
ET1
IEN0.3
00
01
10
11
TXD
Serial
Port
RXD
ES
IEN0.4
00
01
10
11
MP3
Decoder
EMP3
IEN0.5
00
01
10
11
Audio
Interface
EAUD
IEN0.6
00
01
10
11
MCLK
MDAT
MCMD
MMC
Controller
EMMC
IEN1.0
00
01
10
11
SCL
TWI
Controller
SDA
EI2C
IEN1.1
00
01
10
11
SCK
SI
SO
SPI
Controller
ESPI
IEN1.2
00
01
10
11
KIN0
Keyboard
EKB
IEN1.4
00
01
10
11
D+
D-
USB
Controller
EUSB
IEN1.6
EA
IEN0.7
IPH/L
Interrupt Enable
Priority Enable
Lowest Priority Interrupts
38
AT8xC51SND2C
4341D–MP3–04/05