ST10F269 datasheet(48/160 Pages) STMICROELECTRONICS

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ST10F269

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9 - CAPTURE/COMPARE (CAPCOM) UNITS

The ST10F269 has two 16 channels CAPCOM

units as described in Figure 12. These support

generation and control of timing sequences on up

to 32 channels with a maximum resolution of

200ns at 40MHz CPU clock. The CAPCOM units

are typically used to handle high speed I/O tasks

such as pulse and waveform generation, pulse

width modulation (PMW), Digital to Analog (D/A)

conversion, software timing, or time recording

relative to external events.

Four 16-bit timers (T0/T1, T7/T8) with reload

registers provide two independent time bases for

the capture/compare register array (See Figures

13 and 14).

The input clock for the timers is programmable to

several prescaled values of the internal system

clock, or may be derived from an overflow/

underflow of timer T6 in module GPT2. This

provides a wide range of variation for the timer

period

and

resolution

and

allows

precise

adjustments to application specific requirements.

In addition, external count inputs for CAPCOM

timers T0 and T7 allow event scheduling for the

capture/compare registers relative to external

events.

Each of the two capture/compare register arrays

contain

dual

purpose

capture/compare

registers, each of which may be individually

allocated to either CAPCOM timer T0 or T1 (T7 or

T8, respectively), and programmed for capture or

compare functions. Each of the 32 registers has

one associated port pin which serves as an input

pin for triggering the capture function, or as an

output pin to indicate the occurrence of a compare

event. Figure 12 shows the basic structure of the

two CAPCOM units.

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

Figure 12 : CAPCOM Unit Block Diagram

Input

Control

2n n = 3...10

GPT2 Timer T6

TxIN

CPU

Clock

Mode

Control

(Capture

Compare)

Capture inputs

Compare outputs

Input

Control

2n n = 3...10

GPT2 Timer T6

Over / Underflow

CPU

Clock

Reload Register TxREL

CAPCOM Timer Tx

Interrupt

Request

Sixteen 16-bit

(Capture/Compare)

Registers

Over / Underflow

CAPCOM Timer Ty

Reload Register TyREL

Capture / Compare*

Interrupt Requests

Interrupt

Request

x = 0, 7

y = 1, 8

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