ST10F271Z1 datasheet(60/185 Pages) STMICROELECTRONICS

60 / 185 page

General purpose timer unit

ST10F271Z1

60/185

Table 36 and Table 37 list the timer input frequencies, resolution and periods for each

prescaler option at 40MHz and 64MHz CPU clock respectively.

Figure 11.

Block diagram of GPT2

Table 36.

GPT2 timer input frequencies, resolutions and periods at 40 MHz

CPU = 40 MHz

Timer input selection T5I / T6I

000b

001b

010b

011b

100b

101b

110b

111b

Prescaler factor

128

256

512

Input freq

10 MHz

5 MHz

2.5 MHz

1.25 MHz

625 kHz

312.5 kHz 156.25 kHz 78.125 kHz

Resolution

100 ns

200 ns

400 ns

0.8µs

1.6 µs

3.2 µs

6.4 µs

12.8 µs

Period maximum

6.55 ms

13.1ms

26.2 ms

52.4 ms

104.8 ms

209.7ms

419.4 ms

838.9 ms

Table 37.

GPT2 timer input frequencies, resolutions and periods at 64 MHz

CPU = 64 MHz

Timer input selection T5I / T6I

000b

001b

010b

011b

100b

101b

110b

111b

Prescaler factor

128

256

512

Input freq

16 MHz

8 MHz

4 MHz

2 MHz

1 kHz

500 kHz

250 kHz

128 kHz

Resolution

62.5 ns

125 ns

250 ns

0.5 µs

1.0 µs

2.0 µs

4.0 µs

8.0 µs

Period maximum

4.1 ms

8.2 ms

16.4 ms

32.8 ms

65.5 ms

131.1 ms

262.1 ms

524.3 ms

2n n=2...9

T5EUD

T5IN

CPU clock

T6IN

T6EUD

GPT2 Timer T5

GPT2 Timer T6

U/D

Interrupt

Request

U/D

GPT2 CAPREL

T60TL

Toggle FF

T6OUT

CAPIN

Reload

Interrupt

Request

to CAPCOM

Timers

Capture

Clear

Interrupt

Request

Mode

Control

Mode

Control

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