ST10F269ZX datasheet(53/184 Pages) STMICROELECTRONICS

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ST10F269

10 - GENERAL PURPOSE TIMER UNIT

53/184

Table 13 : GPT1 Timer Input Frequencies, Resolution and Periods (TQFP144 devices)

Figure 15 : Block Diagram of GPT1

10.2 - GPT2

The GPT2 module provides precise event control

and time measurement. It includes two timers (T5,

T6) and a capture/reload register (CAPREL). Both

timers can be clocked with an input clock which is

derived from the CPU clock via a programmable

prescaler or with external signals. The count

direction

(up/down)

for

each

timer

programmable by software or may additionally be

altered dynamically by an external signal on a port

pin (TxEUD). Concatenation of the timers is

supported via the output toggle latch (T6OTL) of

timer T6 which changes its state on each timer

overflow/underflow.

The state of this latch may be used to clock timer

T5, or it may be output on a port pin (T6OUT). The

overflow / underflow of timer T6 can additionally

be used to clock the CAPCOM timers T0 or T1,

and to cause a reload from the CAPREL register.

The CAPREL register may capture the contents of

timer T5 based on an external signal transition on

the corresponding port pin (CAPIN), and timer T5

may optionally be cleared after the capture

procedure. This allows absolute time differences

to be measured or pulse multiplication to be

performed without software overhead.

The capture trigger (timer T5 to CAPREL) may

also be generated upon transitions of GPT1 timer

inputs

T3IN

and/or

T3EUD.

This

advantageous when T3 operates in Incremental

Interface Mode.

Table 14

GPT2

Timer

Input

Frequencies,

Resolution and Period (PQFP144 devices) and

Table 15

GPT2

Timer

Input

Frequencies,

fCPU = 32MHz

Timer Input Selection T2I / T3I / T4I

000b

001b

010b

011b

100b

101b

110b

111b

Pre-scaler factor

128

256

512

1024

Input Freq

4MHz

2MHz

1MHz

500KHz

250KHz

125KHz

62.5KHz

31.125KHz

Resolution

250ns

500ns

µs2µs4µs8µs16µs32µs

Period maximum

16.4ms

32.8ms

65.5ms

131ms

262.1ms

524.3ms

1.05s

2.1s

2n n=3...10

T2EUD

T2IN

CPU Clock

T3IN

T4IN

T3EUD

T4EUD

Mode

Control

Mode

Control

Mode

Control

GPT1 Timer T2

GPT1 Timer T3

GPT1 Timer T4

T3OTL

Reload

Capture

U/D

Reload

Capture

Interrupt

Request

Interrupt

Request

Interrupt

Request

T3OUT

U/D

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