AT83SND2CMP3B datasheet(7/242 Pages) ATMEL

7 / 242 page

4341H–MP3–10/07

AT8xC51SND2C/MP3B

Table 4-4.

Audio Interface Signal Description

Table 4-5.

USB Controller Signal Description

Table 4-6.

MutiMediaCard Interface Signal Description

INT1

Timer 1 Gate Input

INT1 serves as external run control for timer 1, when selected by GATE1 bit in

TCON register.

External Interrupt 1

INT1 input sets IE1 in the TCON register. If bit IT1 in this register is set, bit IE1

is set by a falling edge on INT1#. If bit IT1 is cleared, bit IE1 is set by a low

level on INT1#.

P3.3

Timer 0 External Clock Input

When timer 0 operates as a counter, a falling edge on the T0 pin increments

the count.

P3.4

Timer 1 External Clock Input

When timer 1 operates as a counter, a falling edge on the T1 pin increments

the count.

P3.5

Signal

Name

Type

Description

Alternate

Function

DCLK

DAC Data Bit Clock

DOUT

DAC Audio Data Output

DSEL

DAC Channel Select Signal

DSEL is the sample rate clock output.

SCLK

DAC System Clock

SCLK is the oversampling clock synchronized to the digital audio data (DOUT)

and the channel selection signal (DSEL).

Signal

Name

Type

Description

Alternate

Function

D+

I/O

USB Positive Data Upstream Port

This pin requires an external 1.5 KΩ pull-up to V

DD for full speed operation.

D-

I/O

USB Negative Data Upstream Port

Signal

Name

Type

Description

Alternate

Function

MCLK

MMC Clock output

Data or command clock transfer.

MCMD

I/O

MMC Command line

Bidirectional command channel used for card initialization and data transfer

commands. To avoid any parasitic current consumption, unused MCMD input

must be polarized to V

DD or VSS.

MDAT

I/O

MMC Data line

Bidirectional data channel. To avoid any parasitic current consumption, unused

MDAT input must be polarized to V

DD or VSS.

Signal

Name

Type

Description

Alternate

Function

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