AT91SAM7S256 ATMEL Corporation, AT91SAM7S256 Datasheet - Page 2

• Manufacturer Part Number: AT91SAM7S256
• Description: AT91 ARM THUMB-BASED MICROCONTROLLERS
• Manufacturer: ATMEL Corporation

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Description
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One Three-channel 16-bit Timer/Counter (TC)
One Four-channel 16-bit PWM Controller (PWMC)
One Two-wire Interface (TWI)
One 8-channel 10-bit Analog-to-Digital Converter, Four Channels Multiplexed with Digital I/Os
IEEE 1149.1 JTAG Boundary Scan on All Digital Pins
5V-tolerant I/Os, including Four High-current Drive I/O lines, Up to 16 mA Each
Power Supplies
Fully Static Operation: Up to 55 MHz at 1.65V and 85°C Worst Case Conditions
Available in a 64-lead LQFP Package
– Three External Clock Inputs, Two Multi-purpose I/O Pins per Channel
– Double PWM Generation, Capture/Waveform Mode, Up/Down Capability
– Master Mode Support Only, All Two-wire Atmel EEPROMs Supported
– Embedded 1.8V Regulator, Drawing up to 100 mA for the Core and External Components
– 3.3V VDDIO I/O Lines Power Supply, Independent 3.3V VDDFLASH Flash Power Supply
– 1.8V VDDCORE Core Power Supply with Brownout Detector
AT91SAM7S256 Summary Preliminary
Atmel’s AT91SAM7S256 is a member of a series of low pincount Flash microcontrollers
based on the 32-bit ARM RISC processor. It features a 256 Kbyte high-speed Flash and
a 64 Kbyte SRAM, a large set of peripherals, including a USB 2.0 device, and a com-
plete set of system functions minimizing the number of external components. The
device is an ideal migration path for 8-bit microcontroller users looking for additional per-
formance and extended memory.
The embedded Flash memory can be programmed in-system via the JTAG-ICE inter-
face or via a parallel interface on a production programmer prior to mounting. Built-in
lock bits and a security bit protect the firmware from accidental overwrite and preserves
its confidentiality.
The AT91SAM7S256 system controller includes a reset controller capable of managing
the power-on sequence of the microcontroller and the complete system. Correct device
operation can be monitored by a built-in brownout detector and a watchdog running off
an integrated RC oscillator.
The AT91SAM7S256 is a general-purpose microcontroller. Its integrated USB Device
port makes it an ideal device for peripheral applications requiring connectivity to a PC or
cellular phone. Its aggressive price point and high level of integration pushes its scope
of use far into the cost-sensitive, high-volume consumer market.
6117AS–ATARM–20-Oct-04