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AT91M42800A-33AU Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT91M42800A-33AU Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 27 page 10 1779ES–ATARM–14-Apr-06 AT91M42800A interrupt request to the ARM7TDMI. It integrates an 8-level priority controller, and, using the Auto-vectoring feature, reduces the interrupt latency time. The Parallel Input/Output Controllers (PIOA, PIOB) controls up to 54 I/O lines. It enables the user to select specific pins for on-chip peripheral input/output functions, and general-purpose input/output signal pins. The PIO controllers can be programmed to detect an interrupt on a sig- nal change from each line. There are three embedded system timers. The Real-time Timer (RTT) counts elapsed seconds and can generate periodic or programmed interrupts. The Period Interval Timer (PIT) can be used as a user-programmable time-base, and can generate periodic ticks. The Watchdog (WD) can be used to prevent system lock-up if the software becomes trapped in a deadlock. The Special Function (SF) module integrates the Chip ID and the Reset Status registers. 5.2.2 User Peripherals Two USARTs, independently configurable, enable communication at a high baud rate in syn- chronous or asynchronous mode. The format includes start, stop and parity bits and up to 9 data bits. Each USART also features a Time-out and a Time-guard register, facilitating the use of the two dedicated Peripheral Data Controller (PDC) channels. The two 3-channel, 16-bit Timer/Counters (TC) are highly-programmable and support capture or waveform modes. Each TC channel can be programmed to measure or generate different kinds of waves, and can detect and control two input/output signals. Each TC also has three external clock signals. Two independently configurable SPIs provide communication with external devices in master or slave mode. Each has four external chip selects which can be connected to up to 15 devices. The data length is programmable, from 8- to 16-bit. 6. Associated Documentation Table 6-1. Associated Documentation Product Information Document Title AT91M42800A Internal architecture of processor ARM/Thumb instruction sets Embedded in-circuit-emulator ARM7TDMI (Thumb) Datasheet External memory interface mapping Peripheral operations Peripheral user interfaces AT91M42800A Datasheet DC characteristics Power consumption Thermal and reliability considerations AC characteristics AT91M42800A Electrical Characteristics Product overview Ordering information Packaging information Soldering profile AT91M42800A Summary Datasheet (this document) |
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