ST10F269Z1Q3 datasheet(50/184 Pages) STMICROELECTRONICS

50 / 184 page

9 - CAPTURE/COMPARE (CAPCOM) UNITS

ST10F269

50/184

* The CAPCOM2 unit provides 16 capture inputs, but only 12 compare outputs. CC24I to CC27I are inputs only.

Figure 13 : Block Diagram of CAPCOM Timers T0 and T7

Figure 14 : Block Diagram of CAPCOM Timers T1 and T8

Note: When

external

input

signal

connected to the input lines of both T0 and

T7, these timers count the input signal

synchronously. Thus the two timers can be

regarded as one timer whose contents can

be compared with 32 capture registers.

When a capture/compare register has been

selected for capture mode, the current contents of

the allocated timer will be latched (captured) into

the capture/compare register in response to an

external event at the port pin which is associated

with this register. In addition, a specific interrupt

request for this capture/compare register is

generated.

Either a positive, a negative, or both a positive and

a negative external signal transition at the pin can

be selected as the triggering event. The contents

of all registers which have been selected for one

of the five compare modes are continuously

compared with the contents of the allocated

timers.

When a match occurs between the timer value

and the value in a capture /compare register,

specific actions will be taken based on the

selected compare mode (see Table 9).

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 on PQFP144 devices (or a

32MHz CPU clock on TQFP144 devices) are

listed in Table 10 and 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.

Txl

CPU

Clock

TxR

MUX

GPT2 Timer T6

Over / Underflow

Edge Select

TxIN

Txl

Txl TxM

Input

Control

Reload Register TxREL

CAPCOM Timer Tx

TxIR

Interrupt

Request

x = 0, 7

Txl

CPU

Clock

TxR

MUX

GPT2 Timer T6

Over / Underflow

TxM

Reload Register TxREL

CAPCOM Timer Tx

TxIR

Interrupt

Request

x = 1, 8

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