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ATMEGA161 Datasheet(PDF) 2 Page - ATMEL Corporation

Part No. ATMEGA161
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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 2 page
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ATmega161(L)
2
Pin Configurations
Description
The ATmega161 is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful
instructions in a single clock cycle, the ATmega161 achieves throughputs approaching 1 MIPS per MHz allowing the sys-
tem designer to optimize power consumption versus processing speed.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 conventional CISC
microcontrollers.
The ATmega161 provides the following features: 16K bytes of In-System- or Self-programmable Flash, 512 bytes
EEPROM, 1K bytes SRAM, 35 general purpose I/O lines, 32 general purpose working registers, Real Time Counter, three
flexible timer/counters with compare modes, internal and external interrupts, two programmable serial UARTs, programma-
ble Watchdog Timer with internal oscillator, an SPI serial port and three 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 and SRAM contents but freezes the oscillator, disabling all other chip functions until
the next external interrupt or hardware reset. In Power Save mode, the timer oscillator continues to run, allowing the user to
maintain a timer base while the rest of the device is sleeping.
The device is manufactured using Atmel’s high density nonvolatile memory technology. The on-chip Flash program mem-
ory can be reprogrammed using the self-programming capability through the bootblock, using an ISP through the SPI-port,
or by using a conventional nonvolatile memory programmer. By combining an enhanced RISC 8-bit CPU with In-System
Programmable Flash on a monolithic chip, the Atmel ATmega161 is a powerful microcontroller that provides a highly
flexible and cost effective solution to many embedded control applications.
The ATmega161 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.
TQFP
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33
32
31
30
29
28
27
26
25
24
23
(MOSI) PB5
(MISO) PB6
(SCK) PB7
RESET
(RXD0) PD0
NC*
(TXD0) PD1
(INT0) PD2
(INT1) PD3
(TOSC1) PD4
(OCIA/TOSC2) PD5
PA4 (AD4)
PA5 (AD5)
PA6 (AD6)
PA7 (AD7)
PE0 (ICP/INT2)
NC*
PE1 (ALE)
PE2 (OC1B)
PC7 (A15)
PC6 (A14)
PC5 (A13)
* NC = Do not connect
(Can be used in future devices)
PLCC
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32
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(MOSI) PB5
(MISO) PB6
(SCK) PB7
RESET
(RXD0) PD0
NC*
(TXD0) PD1
(INT0) PD2
(INT1) PD3
(TOSC1) PD4
(OC1A/TOSC2) PD5
PA4 (AD4)
PA5 (AD5)
PA6 (AD6)
PA7 (AD7)
PE0 (ICP/INT2)
NC*
PE1 (ALE)
PE2 (OC1B)
PC7 (A15)
PC6 (A14)
PC5 (A13)
* NC = Do not connect
(Can be used in future devices)
PDIP
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32
31
30
29
28
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(OC0/T0) PB0
(OC2/T1) PB1
(RXD1/AIN0) PB2
(TXD1/AIN1) PB3
(SS) PB4
(MOSI) PB5
(MISO) PB6
(SCK) PB7
RESET
(RXD0) PD0
(TXD0) PD1
(INT0) PD2
(INT1) PD3
(TOSC1) PD4
(OC1A/TOSC2) PD5
(WR) PD6
(RD) PD7
XTAL2
XTAL1
GND
VCC
PA0 (AD0)
PA1 (AD1)
PA2 (AD2)
PA3 (AD3)
PA4 (AD4)
PA5 (AD5)
PA6 (AD6)
PA7 (AD7)
PE0 (ICP/INT2)
PE1 (ALE)
PE2 (OC1B)
PC7 (A15)
PC6 (A14)
PC5 (A13)
PC4 (A12)
PC3 (A11)
PC2 (A10)
PC1 (A9)
PC0 (A8)




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