EM351-RTR datasheet(149/241 Pages) SILABS

149 / 241 page

149

Rev 1.3

TIM_ETF

[11:8]

External Trigger Filter.

This defines the frequency used to sample the ETRP signal, Fsampling, and

the length of the digital filter applied to ETRP. The digital filter is made of an

event counter in which N events are needed to validate a transition on the

output:

0000: Fsampling = PCLK, no filtering.

0001: Fsampling = PCLK, N = 2.

0010: Fsampling = PCLK, N = 4.

0011: Fsampling = PCLK, N = 8.

0100: Fsampling = PCLK/2, N = 6.

0101: Fsampling = PCLK/2, N = 8.

0110: Fsampling = PCLK/4, N = 6.

0111: Fsampling = PCLK/4, N = 8.

1000: Fsampling = PCLK/8, N = 6.

1001: Fsampling = PCLK/8, N = 8.

1010: Fsampling = PCLK/16, N = 5.

1011: Fsampling = PCLK/16, N = 6.

1100: Fsampling = PCLK/16, N = 8.

1101: Fsampling = PCLK/32, N = 5.

1110: Fsampling = PCLK/32, N = 6.

1111: Fsampling = PCLK/32, N = 8.

Note:

PCLK is 12 MHz when the EM35x is using the 24 MHz crystal oscillator, and

6 MHz if using the 12 MHz RC oscillator.

TIM_MSM

[7]

Master/Slave Mode.

0: No action.

1: The effect of an event on the trigger input (TRGI) is delayed to allow exact

synchronization between the current timer and the slave (through TRGO). It is

useful for synchronizing timers on a single external event.

TIM_TS

[6:4]

Trigger Selection.

This bit field selects the trigger input used to synchronize the counter.

000 : Internal Trigger 0 (ITR0).

100 : TI1 Edge Detector (TI1F_ED).

101 : Filtered Timer Input 1 (TI1FP1).

110 : Filtered Timer Input 2 (TI2FP2).

111 : External Trigger input (ETRF).

Note:

These bits must be changed only when they are not used (when

TIM_SMS = 000) to avoid detecting spurious edges during the transition.

Bitname

Bitfield

Access

Description

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