AT89C51SND1C-ROTIL ATMEL Corporation, AT89C51SND1C-ROTIL Datasheet - Page 6

• Manufacturer Part Number: AT89C51SND1C-ROTIL
• Description: Single-Chip Microcontroller with MP3 Decoder and Man-Machine Interface
• Manufacturer: ATMEL Corporation

6
AT8xC51SND1C
Table 3. Timer 0 and Timer 1 Signal Description (Continued)
Table 4. Audio Interface Signal Description
Table 5. USB Controller Signal Description
Table 6. MutiMediaCard Interface Signal Description
Signal
Signal
Signal
Signal
Name
Name
Name
Name
MCMD
DOUT
MCLK
MDAT
DCLK
DSEL
SCLK
D+
T0
T1
D-
Type
Type
Type
Type
I/O
I/O
I/O
I/O
O
O
O
O
O
I
I
Description
Timer 0 External Clock Input
When Timer 0 operates as a counter, a falling edge on the T0 pin
increments the count.
Timer 1 External Clock Input
When Timer 1 operates as a counter, a falling edge on the T1 pin
increments the count.
Description
DAC Data Bit Clock
DAC Audio Data
DAC Channel Select Signal
DSEL is the sample rate clock output.
DAC System Clock
SCLK is the oversampling clock synchronized to the digital audio data
(DOUT) and the channel selection signal (DSEL).
Description
USB Positive Data Upstream Port
This pin requires an external 1.5 kΩ pull-up to
operation.
USB Negative Data Upstream Port
Description
MMC Clock output
Data or command clock transfer.
MMC Command line
bi-directional command channel used for card initialization and data
transfer commands. To avoid any parasitic current consumption,
unused MCMD input must be polarized to
MMC Data line
bi-directional data channel. To avoid any parasitic current consumption,
unused MDAT input must be polarized to
V
V
DD
DD
V
or V
or V
DD
SS
SS
for full speed
.
.
4106F–8051–10/02
Alternate
Function
Alternate
Function
Alternate
Function
Alternate
Function
P3.4
P3.5
-
-
-
-
-
-
-
-
-