MCBSTM32EXL【PDF 332/995 页】BOARD EVALUATION FOR STM32F103ZE

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General-purpose timer (TIMx)

Figure 119. Control circuit in normal mode, internal clock divided by 1

CK_INT

CEN=CNT_EN

UG

CNT_INIT

Counter clock = CK_CNT = CK_PSC

RM0008

COUNTER REGISTER

31

32 33 34 35 36 00 01 02 03 04 05 06 07

External clock source mode 1

This mode is selected when SMS=111 in the TIMx_SMCR register. The counter can count

at each rising or falling edge on a selected input.

Figure 120. TI2 external clock connection example

TIMx_SMCR

TS[2:0]

ITRx

001

or

TI2F

TI1F

or

or

encoder

mode

100

111

TI2

Filter

Edge

Detector

TI2F_Rising 0

TI2F_Falling

1

TI1F_ED

TI1FP1 101

TI2FP2 110

ETRF

TRGI

ETRF

external clock

mode 1

external clock

mode 2

CK_PSC

ICF[3:0]

TIMx_CCMR1

CC2P

TIMx_CCER

CK_INT

(internal clock)

internal clock

mode

ECE

SMS[2:0]

TIMx_SMCR

For example, to configure the upcounter to count in response to a rising edge on the TI2

input, use the following procedure:

For example, to configure the upcounter to count in response to a rising edge on the TI2

input, use the following procedure:

1.

2.

Configure channel 2 to detect rising edges on the TI2 input by writing CC2S= ‘01’ in the

TIMx_CCMR1 register.

Configure the input filter duration by writing the IC2F[3:0] bits in the TIMx_CCMR1

register (if no filter is needed, keep IC2F=0000).

Note:

The capture prescaler is not used for triggering, so you don’t need to configure it.

3.

4.

5.

6.

Select rising edge polarity by writing CC2P=0 in the TIMx_CCER register.

Configure the timer in external clock mode 1 by writing SMS=111 in the TIMx_SMCR

register.

Select TI2 as the input source by writing TS=110 in the TIMx_SMCR register.

Enable the counter by writing CEN=1 in the TIMx_CR1 register.

When a rising edge occurs on TI2, the counter counts once and the TIF flag is set.

332/995

Doc ID 13902 Rev 9

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