AT76C120 데이터 시트보기 (PDF) - Atmel Corporation
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AT76C120 Datasheet PDF : 5 Pages
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Part Versions
Technology
5676AS–MPIXLY–06/04
AT76C120
speed DMAs with FIFOs that leave the main processor free for other system
applications.
• The I2S-compatible audio data interface allows the device to connect with an
external stereo ADC/DAC to capture or play voice or audio. The device can encode
captured audio in various popular formats, and can package it in the same bitstream
as the video or the compressed JPEG pictures. It can also play back stand-alone
audio, such as MP3 files or audio embedded in MPEG bitstreams.
• The USB 1.1 full-speed host controller allows the playback device to connect
directly to digital cameras and either display images from the DSC or download
them to the playback device. The USB 1.1 full-speed slave controller can be used to
connect to a PC for downloading of images from the playback device to the PC.
• The USB 2.0 high-speed slave controller can also be used to connect to a PC for the
downloading of images from the playback device to the PC. This interface is
mutually exclusive from the USB 1.1 interfaces (see “Part Versions” below).
• An USART interface is included for serial communication. It supports standard baud
rates of up to 460.8 Kbps or non-standard rates of up to 4.875 Mbps in
asynchronous mode. It supports rates of up to19.5 Mbps in synchronous mode.
• The serial peripheral interface (SPI) is used to boot from an external EEPROM.
Once the boot code is loaded inside the program memory, the CPU can download
its code from any peripheral supported by the device, including non-volatile storage
media. With two chip select pins, the SPI can also be used to control other external
devices at speeds of up to 19.2 Mbps with 64-bit transfers. Throughput decreases if
the transfer size is reduced or the delay between transfers is increased.
• Three 16-bit general-purpose timers are included and can be used to generate
interrupts to the internal CPU. They can generate waveforms on their associated
pins via Pulse-width Modulation (PWM) or other techniques. They can also monitor
and count external events on these pins.
• A dedicated watchdog timer is available which can provide an interrupt, an event on
an external pin, or a reset to the internal CPU in the event that software is not
responding as expected. Write access to the watchdog is protected by control
access keys to prevent corruption of the watchdog should an error condition occur.
• The device provides up to eight external interrupt pins, depending on the system
configuration, which can be handled by the interrupt controller as either edge or
level sensitive.
• Up to 102 pins can also be configured as GPIOs, depending on the application.
• During normal operation, power consumption may be minimized by disabling the
clock of any internal module that is not in use. In order to further reduce power
consumption, the main CPU clock can be divided to run at a slower speed. In order
to minimize power consumption when the device is not in use, a “sleep mode” is
available that halts the operation of all logic and shuts down the oscillators and
PLLs. Recovery from sleep mode occurs via the WKP (“wakeup”) pin, at which time
the device begins execution from its previous state.
The AT76C120 device comes in two versions. One version has USB 1.1 full-speed host
and slave interfaces, while the other version has a USB 2.0 high-speed slave interface.
The corresponding part numbers are the AT76C120-U1 and the AT76C120-U2, respec-
tively. The pin configuration of each version is mostly the same, but with a few
differences as noted below.
• The device is fabricated in a 0.18 micron process. It is expected that the device will
operate at less than 60 mA when fully active (video compression/decompression).
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