1
Note: This is a summary document. A complete document is
available on our web site at www.atmel.com.
1. Features
High-performance, Low-power AVR
8-bit Microcontroller
Advanced RISC Architecture
133 Powerful Instructions
Most Single Clock Cycle Execution
32 x 8 General Purpose Working Registers + Peripheral Control Registers
Fully Static Operation
Up to 16 MIPS Throughput at 16 MHz
On-chip 2-cycle Multiplier
Non volatile Program and Data Memories
32K/64K Bytes of In-System Reprogrammable Flash (AT90CAN32/64)
Endurance: 10,000 Write/Erase Cycles
Optional Boot Code Section with Independent Lock Bits
Selectable Boot Size: 1K Bytes, 2K Bytes, 4K Bytes or 8K Bytes
In-System Programming by On-Chip Boot Program (CAN, UART)
True Read-While-Write Operation
1K/2K Bytes EEPROM (Endurance: 100,000 Write/Erase Cycles) (AT90CAN32/64)
2K/4K Bytes Internal SRAM (AT90CAN32/64)
Up to 64K Bytes Optional External Memory Space
Programming Lock for Software Security
JTAG (IEEE std. 1149.1 Compliant) Interface
Boundary-scan Capabilities According to the JTAG Standard
Programming Flash (Hardware ISP), EEPROM, Lock & Fuse Bits
Extensive On-chip Debug Support
CAN Controller 2.0A & 2.0B
15 Full Message Objects with Separate Identifier Tags and Masks
Transmit, Receive, Automatic Reply and Frame Buffer Receive Modes
1Mbits/s Maximum Transfer Rate at 8 MHz
Time stamping, TTC & Listening Mode (Spying or Autobaud)
Peripheral Features
Programmable Watchdog Timer with On-chip Oscillator
8-bit Synchronous Timer/Counter-0
10-bit Prescaler
External Event Counter
Output Compare or 8-bit PWM Output
8-bit Asynchronous Timer/Counter-2
10-bit Prescaler
External Event Counter
Output Compare or 8-Bit PWM Output
32Khz Oscillator for RTC Operation
Dual 16-bit Synchronous Timer/Counters-1 & 3
10-bit Prescaler
Input Capture with Noise Canceler
External Event Counter
3-Output Compare or 16-Bit PWM Output
Output Compare Modulation
8-channel, 10-bit SAR ADC
8 Single-ended Channels
7 Differential Channels
2 Differential Channels With Programmable Gain at 1x, 10x, or 200x
On-chip Analog Comparator
Byte-oriented Two-wire Serial Interface
Dual Programmable Serial USART
Master/Slave SPI Serial Interface
Programming Flash (Hardware ISP)
Special Microcontroller Features
Power-on Reset and Programmable Brown-out Detection
Internal Calibrated RC Oscillator
8 External Interrupt Sources
5 Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down & Standby
Software Selectable Clock Frequency
Global Pull-up Disable
I/O and Packages
53 Programmable I/O Lines
64-lead TQFP and 64-lead QFN
Operating Voltages
2.7 - 5.5V
Operating temperature
Industrial (-40
C to +85
C)
Maximum Frequency
8 MHz at 2.7V - Industrial range
16 MHz at 4.5V - Industrial range
Rev. 7538AS
CAN
09/05
8-bit
Microcontroller
with
32/64K Bytes of
ISP Flash
and
CAN Controller
AT90CAN32
AT90CAN64
Summary
2
7538AS
CAN
09/05
AT90CAN32/64
2. Description
2.1
Comparison Between AT90CAN32/64 and AT90CAN128
AT90CAN32/64 is hardware and software compatible with AT90CAN128, the only difference is
the memory size.
2.2
Part Desription
The AT90CAN32/64 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced
RISC architecture. By executing powerful instructions in a single clock cycle, the
AT90CAN32/64 achieves throughputs approaching 1 MIPS per MHz allowing the system
designer to optimize power consumption versus processing speed.
The AVR core combines a rich instruction set with 32 general purpose working registers. All 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 AT90CAN32/64 provides the following features: 32K/64K bytes of In-System Programmable
Flash with Read-While-Write capabilities, 1K/2K bytes EEPROM, 2K/4K bytes SRAM, 53 gen-
eral purpose I/O lines, 32 general purpose working registers, a CAN controller, Real Time
Counter (RTC), four flexible Timer/Counters with compare modes and PWM, 2 USARTs, a byte
oriented Two-wire Serial Interface, an 8-channel 10-bit ADC with optional differential input stage
with programmable gain, a programmable Watchdog Timer with Internal Oscillator, an SPI serial
port, IEEE std. 1149.1 compliant JTAG test interface, also used for accessing the On-chip
Debug system and programming and five software selectable power saving modes.
The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI/CAN ports 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 main-
tain 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/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 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,
Table 2-1.
Memory Size Summary
Device
Flash
EEPROM
RAM
AT90CAN32
32K Bytes
1K Byte
2K Bytes
AT90CAN64
64K Bytes
2K Bytes
4K Bytes
AT90CAN128
128K Bytes
4K Byte
4K Bytes
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