BLUENRG-2 datasheet(131/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

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TnAEN

TnBEN

Mode 1

Mode 1a

Mode 2

Mode 3

Mode 4

PWM and

counter

PWM pulse

train

Dual-input

capture and

counter

Dual

independent

counter

Input capture

plus timer

TnAEN

= X

TnBEN

= 1

External event

or pulse

accumulate

input

External

event if

TnPTSE = 0

Capture

TnCNT1 into

TnCRB and

preset

TnCNT1

External event

or pulse

accumulate

input

Capture

TnCNT2 into

TnCRB and

preset

TnCNT2

3.13.2.7

IO configuration linked to MFT timers

The MFT timers can be connected to the BlueNRG1 IO pins for the following features:



Input signal to trig the timer in capture mode.



Output signal when PWM mode is used (clock output emulation with controlled duty

cycle)

In capture mode, the timer waits for an external IO event to start counting. The chosen IO

for capture is programmed through IOSEL_MFTX register in IO peripheral. This register

allows configuring input capture IO for timers A and B of both MFT1 and MFT2, depending

on which timer(s) are configured in capture mode.

In PWM mode, the signal is output on PWM0 IO for MFT1 and PWM1 for MFT2. Those IOs

are available at different location thanks to alternate option. So to output the chosen PWM

signal, it is necessary to configure the IO with the dedicated mode.

3.13.2.8

Timers interrupts

All sources have a pending flag associated with them, and can be enabled or disabled by

software. The pending flags are named TnXPND, where n denotes the instance of the

module, and X represents a letter from A to D. An interrupt enable flag (TnXIEN) is

associated with each interrupt-pending flag. Interrupt sources A, B and C can each

generate a timer interrupt MFT1A for MFT1 and MFT2A for MFT2, whereas interrupt

source D can generate a timer interrupt MFT1B for MFT1 and MFT2B for MFT2. Not all

interrupt sources are available in all modes. Table 158: "MFT interrupt functions" shows

which events can trigger an interrupt in which mode of operation.

Table 158: MFT interrupt functions

Sys. Int.

Interrupt

pending

flag

Mode 1

Mode 1a

Mode 2

Mode 3

Mode 4

PWM and

counter

PWM

pulse train

Dual-input

capture

and

counter

Dual

independent

counter

Input

capture

plus timer

Timer int.

1 (MFT1A,

MFT2A)

TnAPND

TnCNT1

reload from

TnCRA

TnCNT1

reload from

TnCRA

Input

capture on

TnA

transition

TnCNT1

reload from

TnCRA

TnCNT1

reload from

TnCRA

TnBPND

TnCNT1

reload from

TnCRB

TnCNT1

reload from

TnCRB

Input

capture on

TnB

transition

N/A

Input

capture on

TnB

transition

TnCPND

N/A

TnCNT1

underflow

N/A

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