Atmel AT89C5132 Specification Sheet page 6

AT89C5132
6
Signal
Name Type Description
Timer 0 External Clock Input
T0 I When timer 0 operates as a counter, a falling edge on the T0 pin increments
the count.
Timer 1 External Clock Input
T1 I When timer 1 operates as a counter, a falling edge on the T1 pin increments
the count.
Table 4. Audio Interface Signal Description
Signal
Name Type Description
DCLK O DAC Data Bit Clock
DOUT O DAC Audio Data
DAC Channel Select Signal
DSEL O
DSEL is the sample rate clock output.
DAC System Clock
SCLK O SCLK is the oversampling clock synchronized to the digital audio data (DOUT)
and the channel selection signal (DSEL).
Table 5. USB Controller Signal Description
Signal
Name Type Description
USB Positive Data Upstream Port
D+ I/O
This pin requires an external 1.5 KΩ pull-up to V
D- I/O USB Negative Data Upstream Port
Table 6. MutiMediaCard Interface Signal Description
Signal
Name Type Description
MMC Clock output
MCLK O
Data or command clock transfer.
MMC Command line
Bidirectional command channel used for card initialization and data transfer
MCMD I/O
commands. To avoid any parasitic current consumption, unused MCMD input
must be polarized to V
MMC Data line
MDAT I/O Bidirectional data channel. To avoid any parasitic current consumption, unused
MDAT input must be polarized to V
for full speed operation.
DD
or V .
DD SS
or V .
DD SS
Alternate
Function
P3.4
P3.5
Alternate
Function
-
-
-
-
Alternate
Function
-
-
Alternate
Function
-
-
-
4173ES–USB–09/07