Spis treści

Overview

There are 10 Timers on the STM32F405 chip being used by the mircropython KS project. Not all Timers have pins allocated to them on this 64 pin package. (The 407 based chipsets have the same allocation of timers.) Timers in this chipset come with various capabilities:

TIM1 and TIM8 are advanced 16 bit timers and can count up and down. They can be used to drive steppers or 3 phase motors. They have special trigger and brake input pins to support this. They are the only timers with pinouts defined for complementary outputs. I.e. they can drive three channels of two pins up and down in perfect synchronisation. They are capable of driving 4 channels for output.
TIM2 and TIM5 are 32 bit Timers. TIM2 can be triggered by an external signal. Both TIM2 and 5 have 4 channels.
TIM3 and TIM4 are 16 bit timers. Both have 4 channels but TIM3 has more pins allocated.
TIM9 and TIM12 are 2 channel timers. Only TIM9 has pins.
TIM10 and TIM11 have a single output channel each.
The remaining Timers 6,7,13,14 do not have any pin connections on the 64 pin package. All timers can be used to generate timebases. Most can do PWM generation. A digram below shows how timers can be cascaded to make longer or triggered timings. Most triggers can also generate Interrupts.

The following timers can sample an input signal and determine its period. 1,2,3,4,5,8,9,10,11

These Timers can be used to correctly determine speed and direction from externally supplied quadrature signals. 1,2,3,4,5,8,9

Timer Summary:

Advanced - TIM1,8

16bit, 4 channels (2x complementary)
can generate up to three complementary outputs with insertion of dead time
- ideal for motor control.
- seen as three phase PWM generators multiplexed on 6 channels
max speed 168 MHz, max interface speed 84 MHz
independent DMA request generation
as 16bit PWM generators they have full 100% modulation capability
TIM1 can be slaved to TIM5,2,3,4
TIM8 can be slaved to TIM1,2,4,5

GP 16bit - TIM3,4

4 channels (not complementary)
timing, delay, one pulse, input capture, encoder input
up, down count with DMA control, Master/slave
can generate PWM output
16 bit prescaler
max speed 84 MHz, max interface speed 42 MHz
TIM3 can be slaved to TIM1,2,5,4
TIM4 can be slaved to TIM1,2,3,8

GP 32bit - TIM2,5

4 channels (not complementary)
timing, delay, one pulse, input capture, encoder input
up, down count with DMA control, Master/slave
can generate PWM output
16 bit prescaler
max speed 84 MHz, max interface speed 42 MHz
TIM2 can be slaved to TIM1,8,3,4
TIM5 can be slaved to TIM2,3,4,8

Basic - TIM6,7

0 channels - no direct external pin control.
must be Masters
up count only with DMA control
16 bit prescaler
used for timebase timers or triggering the DAC
max speed 84 MHz, max interface speed 42 MHz

1 channel - TIM10,11,13,14

general purpose timers
up count only, no DMA control
can generate PWM output
16 bit prescaler
must be Masters
TIM13,14 - max speed 84 MHz, max interface speed 42 MHz
TIM10,11 - max speed 168 MHz, max interface speed 84 MHz

2 channel - TIM9,12

2 independent channels
general purpose timers, Master/slave
up count only, no DMA control
can generate PWM output
16 bit prescaler
TIM12 - max speed 84 MHz, max interface speed 42 MHz
TIM9 - max speed 168 MHz, max interface speed 84 MHz
TIM12 can be slaved to TIM4,5,13,14
TIM9 can be slaved to TIM2,3,10,11 Independent watchdog
12 bit downcounter and 8 bit prescaler
driven from independent 32kHz rc clock
operates in stop or standby mode and can reset the device
can be used as free running app timeout counter

Window watchdog

free running 7bit downcounter
clocked from main clock
can reset the device or generate interrupt

SysTick timer

24 bit downcounter from main clock
autoreload capability
maskable interrupt on = 0

General info

Getting Started

Resources

micropython-lib
Awesome MicroPython

About MicroPython

Differences to CPython
Performance