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. 512 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 4.1'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 4.1 executes all of these with FPU hardware.

FEATURES



ARM Cortex-M7 at 600MHz



1024K RAM (512K is tightly coupled)



8 Mbyte Flash (64K reserved for recovery & EEPROM emulation)



USB Host Port



2 chips Plus Program Memory



55 Total I/O Pins



3 CAN Bus (1 with CAN FD)





1 S/PDIF Digital Audio



1 SDIO (4 bit) native SD



3 SPI, all with 16 word FIFO



7 Bottom SMT Pad Signals



8 Serial ports



32 general purpose DMA channels



35 PWM pins



42 Breadboard Friendly I/O



18 analog inputs



Cryptographic Acceleration



Random Number Generator



RTC for date/time



Programmable FlexIO



Pixel Processing Pipeline



Peripheral cross triggering



10 / 100 Mbit DP83825 PHY (6 pins)



microSD Card Socket



Power On/Off management



Pre-soldered Male Headers