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2503QS–AVR–02/11
ATmega32(L)
The Atmel
AVR core combines a rich instruction set with 32 general purpose working regis-
ters. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two
independent registers to be accessed in one single 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 ATmega32 provides the following features: 32Kbytes of In-System Programmable Flash
Program memory with Read-While-Write capabilities, 1024bytes EEPROM, 2Kbyte SRAM, 32
general purpose I/O lines, 32 general purpose working registers, a JTAG interface for Boundary-
scan, On-chip Debugging support and programming, three flexible Timer/Counters with com-
pare modes, Internal and External Interrupts, a serial programmable USART, a byte oriented
Two-wire Serial Interface, an 8-channel, 10-bit ADC with optional differential input stage with
programmable gain (TQFP package only), a programmable Watchdog Timer with Internal Oscil-
lator, an SPI serial port, and six software selectable power saving modes. The Idle mode stops
the CPU while allowing the USART, Two-wire interface, A/D Converter, SRAM, Timer/Counters,
SPI port, and interrupt system to continue functioning. The Power-down mode saves the register
contents but freezes the Oscillator, disabling all other chip functions until the next External Inter-
rupt or Hardware Reset. In Power-save mode, the Asynchronous Timer continues to run,
allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC
Noise Reduction mode stops the CPU and all I/O modules except Asynchronous Timer and
ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/reso-
nator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up
combined with low-power consumption. In Extended Standby mode, both the main Oscillator
and the Asynchronous Timer continue to run.
The device is manufactured using Atmel’s high density nonvolatile memory technology. The On-
chip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serial
interface, by a conventional nonvolatile memory programmer, or by an On-chip Boot program
running on the AVR core. The boot program can use any interface to download the application
program in the Application Flash memory. Software in the Boot Flash section will continue to run
while the Application Flash section is updated, providing true Read-While-Write operation. By
combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip,
the Atmel ATmega32 is a powerful microcontroller that provides a highly-flexible and cost-effec-
tive solution to many embedded control applications.
The Atmel AVR ATmega32 is supported with a full suite of program and system development
tools including: C compilers, macro assemblers, program debugger/simulators, in-circuit emula-
tors, and evaluation kits.
Pin Descriptions
VCC
Digital supply voltage.
GND
Ground.
Port A (PA7..PA0)
Port A serves as the analog inputs to the A/D Converter.
Port A also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used. Port pins
can provide internal pull-up resistors (selected for each bit). The Port A output buffers have sym-
metrical drive characteristics with both high sink and source capability. When pins PA0 to PA7
are used as inputs and are externally pulled low, they will source current if the internal pull-up
resistors are activated. The Port A pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
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相关PDF资料
06FMN-BMTTN-A-TF CONN FMN HSNG 6POS STAG NOR SMD
05FMN-BMTTN-A-TF CONN FMN HSNG 5POS STAG NOR SMD
04FMN-BMTTN-A-TF CONN FMN HSNG 4POS STAG NOR SMD
40FMN-BMTR-A-TB CONN FMN HSNG 40POS SGL REV SMD
36FMN-BMTR-A-TB CONN FMN HSNG 36POS SGL REV SMD
35FMN-BMTR-A-TB CONN FMN HSNG 35POS SGL REV SMD
34FMN-BMTR-A-TB CONN FMN HSNG 34POS SGL REV SMD
29FMN-BMTR-A-TB CONN FMN HSNG 29POS SGL REV SMD
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