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AT91SAM7A2-AI Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT91SAM7A2-AI Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 16 page 8 PRELIMINARY AT91SAM7A2 - Summary 6021BS–ATARM–06-Jul-04 be level sensitive or edge triggered. External sources can be programmed to be positive or negative edge triggered or high or low level sensitive. PIO: Parallel I/O Controller The AT91SAM7A2 has 57 configurable I/O lines. 32 pins (United PIO) on the AT91SAM7A2 are dedicated as general purpose I/O pins (UPIO0 to UPIO31). Other I/O lines are multiplexed with an external signal of a peripheral to optimize the use of available package pins. The United-PIO is controlled by a dedicated module. The others pins are configure in each module. PDC: Peripheral Data Controller An on-chip, 10-channel Peripheral Data Controller (PDC) transfers data between the on-chip peripherals and the on and off-chip memories without processor intervention. One PDC chan- nel is connected to the receiving channel and one to the transmitting channel of each USART and of the SPI. A single PDC channel is connected to each ADC and each Capture. Most importantly, the PDC removes the processor interrupt handling over-head and signifi- cantly reduces the number of clock cycles required for a data transfer. It can transfer up to 64 Kbytes without reprogramming the starting address. As a result, the performance of the micro- controller is increased and the power consumption reduced. USART: Universal Synchronous Asynchronous Receiver Transmitter The AT91SAM7A2 provides two identical, full-duplex, universal synchronous asynchronous receiver transmitter which are connected to the Peripheral Data Controller. The main features are: • Programmable Baud Rate Generator • Parity, Framing and Overrun Error Detection • Line Break Generation and Detection • Automatic Echo, Local & Remote Loopback Modes • Multi-drop Mode: Address Detection and Generation • Interrupt Generation • Two Dedicated Peripheral Data Controller Channels • 5-, 6-, 7-, 8- and 9-bit Character Length • Idle Flag for J1587 Protocol. • Smart Card Transmission Error Feature • Support LIN 1.2 Protocol with H/W Layer SPI: Serial Peripheral Interface The AT91SAM7A2 features an SPI that provides communication with external devices in mas- ter or slave mode. The SPI has four external chip selects that can be connected to up to 15 devices. The data length is programmable from 8- to 16-bit. As for the USART, a two-channel PDC is used to move data directly between memory and the SPI without CPU intervention for maximum real-time processing throughput. CAN: Controller Area Network The AT91SAM7A2 provides four CANs (2.0A and 2.0B). These are based upon serial commu- nications protocol which efficiently supports distributed real-time control with a very high level of security (one with 32 mailboxes and the others with 16 mailboxes). The main features are: • Prioritization of Messages •Multi-master • System Wide Data Consistency • Error Detection and Error Signaling • Automatic Retransmission Of Corrupted Messages |
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