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AT43USB325

ATMEL Corporation
Part Number AT43USB325
Manufacturer ATMEL Corporation
Description Missed Watchdog Timer Reset
Published Mar 23, 2005
Detailed Description Features • • • • • • • • • • • • • • • • AVR® 8-bit RISC Microcontroller with 83 ns Instruction Cycle Time USB Hub with ...
Datasheet PDF File AT43USB325 PDF File

AT43USB325
AT43USB325

Overview
Features • • • • • • • • • • • • • • • • AVR® 8-bit RISC Microcontroller with 83 ns Instruction Cycle Time USB Hub with One Attached and Four External Ports USB Keyboard Function with Four Programmable Endpoints 16 KB Program Memory, 512-Byte Data SRAM 32 x 8 General-purpose Working Registers 42 Programmable I/O Port Pins Support for 20 x 8 Keyboard Matrix Keyboard Scan Inputs with Pull-up Resistor Four LED Driver Outputs One 8-bit Timer/Counter with Separate Pre-scaler One 16-bit Timer/Counter with Separate Pre-scaler and Dual 8-, 9- or 10-bit PWM External and Internal Interrupt Sources Programmable Watchdog Timer 6-MHz Oscillator with On-chip PLL 5V Operation with On-chip 3.
3V Power Supply 64-lead LQFP Package Multimedia USB Keyboard Controller with Embedded Hub AT43USB325 1.
Description The Atmel AT43USB325 is an 8-bit microcontroller based on the AVR RISC architecture.
By executing powerful instructions in a single clock cycle, the AT43USB325 achieves throughputs approaching 12 MIPS.
The AVR core combines a rich instruction set with 32 general-purpose working registers.
All 32 registers are directly connected to the ALU allowing two independent registers to be accessed in one single www.
DataSheet4U.
com instruction executed in one clock cycle.
The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The AT43USB325 features an on-chip 16-Kbyte program memory and 512 bytes of data memory.
It is supported by a standard set of peripherals such as timer/counter modules, watchdog timer and internal and external interrupt sources.
The major peripheral included in the AT43USB325 is the USB Hub with an embedded function and GPIO ports designed for use in a keyboard controller.
The embedded function has 4 endpoints that makes the AT43USB325 extremely suitable for keyboards supporting the consumer page as described in the “USB Usage Tables”.
The AT43USB325 comes in two versions.
The progr...


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