The ARM Cortex-M7 brings many powerful CPU features to a true real-time microcontroller platform.

Cortex-M7 is a dual-issue superscaler processor, meaning the M7 can execute two instructions per

clock cycle, at 600MHz! Of course, executing two simultaneously depends upon the compiler

ordering instructions and registers. Initial benchmarks have shown C++ code compiled by Arduino

tends to achieve two instructions about 40% to 50% of the time while performing numerically

intensive work using integers and pointers. Cortex-M7 is the first ARM microcontroller to use branch

prediction. On M4, loops and other code which much branch take three clock cycles. With M7, after

a loop has executed a few times, the branch prediction removes that overhead, allowing the branch

instruction to run in only a single clock cycle.

Tightly Coupled Memory is a special feature which allows Cortex-M7 fast single cycle access to

memory using a pair of 64 bit wide buses. The ITCM bus provides a 64 bit path to fetch instructions.

The DTCM bus is actually a pair of 32 bit paths, allowing M7 to perform up to two separate memory

accesses in the same cycle. These extremely high speed buses are separate from M7's main AXI

bus, which accesses other memory and peripherals. 512K of memory can be accessed as tightly

coupled memory. Teensyduino automatically allocates your Arduino sketch code into ITCM and all

non-malloc memory use to the fast DTCM, unless you add extra keywords to override the optimized

default. Memory not accessed on the tightly coupled buses is optimized for DMA access by

peripherals. Because the bulk of M7's memory access is done on the two tightly coupled buses,

powerful DMA-based peripherals have excellent access to the non-TCM memory for highly efficient

I/O.

Teensy 4.0's Cortex-M7 processor includes a floating point unit (FPU) which supports both 64 bit

"double" and 32 bit "float". With M4's FPU on Teensy 3.5 & 3.6, and also Atmel SAMD51 chips, only

32 bit float is hardware accelerated. Any use of double, double functions like log(), sin(), cos() means

slow software implemented math. Teensy 4.0 executes all of these with FPU hardware.

Note: Please be aware that the Teensy 4.0 does not include headers and will need to be purchased

separately and soldered on yourself.

FEATURES

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ARM Cortex-M7 at 600MHz

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1024K RAM (512K is tightly coupled)

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2048K Flash (64K reserved for recovery & EEPROM emulation)

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2 USB ports, both 480MBit/sec

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3 CAN Bus (1 with CAN FD)

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1 S/PDIF Digital Audio

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1 SDIO (4 bit) native SD

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3 SPI, all with 16 word FIFO

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7 Serial, all with 4 byte FIFO

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32 general purpose DMA channels

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31 PWM pins

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40 digital pins, all interrrupt capable

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14 analog pins, 2 ADCs on chip

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Cryptographic Acceleration

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Random Number Generator

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RTC for date/time

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Programmable FlexIO

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Pixel Processing Pipeline

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Peripheral cross triggering

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Power On/Off management