ST10F280_12 datasheet(77/239 Pages) STMICROELECTRONICS

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ST10F280

Capture/Compare (CAPCOM) units

Doc ID 8673 Rev. 3

77/239

The input frequencies fTx, for the timer input selector Tx, are determined as a function of the

CPU clocks. The timer input frequencies, resolution and periods which result from the

selected pre-scaler option in TxI when using a 40MHz CPU clock are listed in the Table 11.

The numbers for the timer periods are based on a reload value of 0000h. Note that some

numbers may be rounded to 3 significant figures.

Table 10.

Compare modes

Function

Mode 0

Interrupt-only compare mode; several compare interrupts per timer

period are possible

Mode 1

Pin toggles on each compare match; several compare events per timer

period are possible

Mode 2

Interrupt-only compare mode; only one compare interrupt per timer

period is generated

Mode 3

Pin set ‘1’ on match; pin reset ‘0’ on compare time overflow; only one

compare event per timer period is generated

Double Register Mode

Two registers operate on one pin; pin toggles on each compare match;

several compare events per timer period are possible.

Table 11.

CAPCOM timer input frequencies, resolution and periods

fCPU = 40MHz

Timer input selection TxI

000b

001b

010b

011b

100b

101b

110b

111b

Pre-scaler for fCPU

128

256

512

1024

Input Frequency

5MHz

2.5MHz 1.25MHz

625kHz

312.5kHz

156.25kHz

78.125kHz

39.1kHz

Resolution

200ns

400ns

0.8µs

1.6µs

3.2µs

6.4µs

12.8µs

25.6µs

Period

13.1ms

26.2ms

52.4ms

104.8ms

209.7ms

419.4ms

838.9ms

1.678s

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