programmable Watchdog Timer with Internal Individual Oscillator, an SPI serial port, an On-chip Debug
system and four software selectable power saving modes.
The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI ports, CAN, LIN/UART 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. The ADC Noise
Reduction mode stops the CPU and all I/O modules except ADC, to minimize switching noise during ADC
conversions. 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.
The device is manufactured using the Atmel 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 ATmega16M1/32M1/64M1 is a powerful
microcontroller that provides a highly flexible and cost effective solution to many embedded control
applications.
The Atmel ATmega16M1/32M1/64M1 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.
3.2. Pin descriptions
3.2.1. V
CC
Digital supply voltage.
3.2.2. GND
Ground.
3.2.3. Port B (PB7..PB0)
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
B pins are tri-stated when a reset condition becomes active, even if the clock is not running.
Port B also serves the functions of various special features of the ATmega16M1/32M1/64M1 as listed on
Alternate Functions of Port B. Refer to Alternate Functions of Port B for details.
3.2.4. Port C (PC7..PC0)
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port
C pins are tri-stated when a reset condition becomes active, even if the clock is not running.
Port C also serves the functions of special features of the ATmega16M1/32M1/64M1 as listed in Alternate
Functions of Port C. Refer to Alternate Functions of Port C for details.
3.2.5. Port D (PD7..PD0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D
output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs,
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Summary-10/2016
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