ST10F269 datasheet(52/160 Pages) STMICROELECTRONICS

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ST10F269

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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

lists

the

timer

input

frequencies,

resolution and periods for each pre-scaler option

at 40MHz CPU clock. This also applies to the

Gated Timer Mode of T6 and to the auxiliary timer

T5 in Timer and Gated Timer Mode.

n 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

Table 12 : GPT2 Timer Input Frequencies, Resolution and Period

fCPU = 40MHz

Timer Input Selection T5I / T6I

000b

001b

010b

011b

100b

101b

110b

111b

Pre-scaler factor

128

256

512

Input Freq

10MHz

5MHz

2.5MHz

1.25MHz

625kHz

312.5kHz

156.25kHz

78.125kHz

Resolution

100ns

200ns

400ns

0.8µs

1.6µs

3.2µs

6.4µs

12.8µs

Period maximum

6.55ms

13.1ms

26.2ms

52.4ms

104.8ms

209.7ms

419.4ms

838.9ms

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