ATmega162V-8AI datasheet(4/324 Pages) ATMEL

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2513K–AVR–07/09

ATmega162/V

The AVR core combines a rich instruction set with 32 general purpose working registers. 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 con-

ventional CISC microcontrollers.

The ATmega162 provides the following features: 16K bytes of In-System Programmable Flash

with Read-While-Write capabilities, 512 bytes EEPROM, 1K bytes SRAM, an external memory

interface, 35 general purpose I/O lines, 32 general purpose working registers, a JTAG interface

for Boundary-scan, On-chip Debugging support and programming, four flexible Timer/Counters

with compare modes, internal and external interrupts, two serial programmable USARTs, a pro-

grammable Watchdog Timer with Internal Oscillator, an SPI serial port, and five software

selectable power saving modes. The Idle mode stops the CPU while allowing the 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 interrupt 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. In

Standby mode, the crystal/resonator 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 non-volatile memory technology. The

On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI

serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot Pro-

gram 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 ATmega162 is a powerful microcontroller that provides a highly flexi-

ble and cost effective solution to many embedded control applications.

The ATmega162 AVR is supported with a full suite of program and system development tools

including: C compilers, macro assemblers, program debugger/simulators, In-Circuit Emulators,

and evaluation kits.

ATmega161 and

ATmega162

Compatibility

The ATmega162 is a highly complex microcontroller where the number of I/O locations super-

sedes the 64 I/O locations reserved in the AVR instruction set. To ensure back-ward

compatibility with the ATmega161, all I/O locations present in ATmega161 have the same loca-

tions in ATmega162. Some additional I/O locations are added in an Extended I/O space starting

from 0x60 to 0xFF, (i.e., in the ATmega162 internal RAM space). These locations can be

reached by using LD/LDS/LDD and ST/STS/STD instructions only, not by using IN and OUT

instructions. The relocation of the internal RAM space may still be a problem for ATmega161

users. Also, the increased number of Interrupt Vectors might be a problem if the code uses

absolute addresses. To solve these problems, an ATmega161 compatibility mode can be

selected by programming the fuse M161C. In this mode, none of the functions in the Extended

I/O space are in use, so the internal RAM is located as in ATmega161. Also, the Extended Inter-

rupt Vec-tors are removed. The ATmega162 is 100% pin compatible with ATmega161, and can

replace the ATmega161 on current Printed Circuit Boards. However, the location of Fuse bits

and the electrical characteristics differs between the two devices.

ATmega161

Compatibility Mode

Programming the M161C will change the following functionality:

•

The extended I/O map will be configured as internal RAM once the M161C Fuse is

programmed.

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