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AT83SND2CMP3 Datasheet(PDF) 75 Page - ATMEL Corporation

Part # AT83SND2CMP3
Description  Single-Chip MP3 Decoder with Full Audio Interface
PDF  97 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND2CMP3 Datasheet(HTML) 75 Page - ATMEL Corporation

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AT83SND2CMP3
7524B–MP3–05/06
Interrupt
The Serial I/O Port handles 2 interrupt sources that are the “end of reception” (RI in
SCON) and “end of transmission” (TI in SCON) flags. As shown in Figure 72 these flags
are combined together to appear as a single interrupt source for the C51 core. Flags
must be cleared by software when executing the serial interrupt service routine.
The serial interrupt is enabled by setting ES bit in IEN0 register. This assumes interrupts
are globally enabled by setting EA bit in IEN0 register.
Depending on the selected mode and weather the framing error detection is enabled or
disabled, RI flag is set during the stop bit or during the ninth bit as detailed in Figure 73.
Figure 72. Serial I/O Interrupt System
Figure 73. Interrupt Waveforms
ES
IEN0.4
Serial I/O
Interrupt Request
TI
SCON.1
RI
SCON.0
RXD
D0
D1D2D3D4D5D6D7
Start Bit
8-bit Data
Stop Bit
RI
SMOD0 = X
FE
SMOD0 = 1
a. Mode 1
b. Mode 2 and 3
RXD
D0
D1D2D3D4D5D6
D8
Start bit
9-bit data
Stop bit
RI
SMOD0 = 1
FE
SMOD0 = 1
D7
RI
SMOD0 = 0



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