RM0319 datasheet(359/368 Pages) STMICROELECTRONICS

359 / 368 page

RM0319

General purpose timers (GPT)

Doc ID 022640 Rev 3

359/368

37.4

Operation

When the ENABLE bit in TIMER_CONTROL register is set, the GPT is enabled. Its counter

is cleared and then starts incrementing. When the counter reaches a pre-set compare value

(in TIMER_COMPARE register), two different modes of operation are available (selected by

the MODE bit in the TIMER_CONTROL register):

●

Auto-reload mode: when the counter reaches the compare register value, an interrupt

source is activated, the counter is automatically cleared and restarts incrementing. The

process is repeated until the timer is disabled.

●

Single-shot mode: when the counter reaches the compare register value, an interrupt

source is activated, the counter is stopped and the GPT is disabled.

Capture mode

This function is used for the measurement of input timing signals. When a rising transition

occurs on the TMR_CPTRx pins, the current counter value is stored in the rising edge

capture register (TIMER_REDG_CAPTx) and a dedicated interrupt source is activated.

In the same way, when a falling edge transition occurs on the TMR_CPTRx input pins the

current counter value is stored in the falling edge capture register and another interrupt

source is also activated. Software can then read the value stored in the two capture

registers and compute the time interval from the rising to falling edge (or vice versa).

Basic

GPT1

0xFC80_0000

TMR_CLK1

Output signal which toggles

when TIMER generates an

interrupt. (OUTPUT

generated for both

TIMER/CAPTURE MODE)

See

PL_GPIO

Multiplexing

scheme in

datasheet to

verify the

availability

TMR_CLK2

A10

TMR_CPTR1

C10

These Input pins are used

to receive the signals for

which the measurement of

timing is done. (Used only

in CAPTURE MODE)

TMR_CPTR2

B11

GPT2

0xFCB0_0000

TMR_CLK3

B10

Output signal which toggles

when TIMER generates an

interrupt. (OUTPUT

generated for both

TIMER/CAPTURE MODE)

TMR_CLK4

A11

TMR_CPTR3

C11

These Input pins are used

to receive the signals for

which the measurement of

timing is done. (Used only

in CAPTURE MODE)

TMR_CPTR4

A12

Subsystem

Timer pair

Base address

Signals

Ball

Usage

Note

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