ST10F280 datasheet(107/186 Pages) STMICROELECTRONICS

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ST10F280

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13.3 - XTIMER Peripheral (trigger for ADC

channel injection)

This new peripheral is dedicated for the Channel

Injection Mode of the A/D converter. This mode

injects a channel into a running sequence without

disturbing this sequence. The peripheral event

controller stores the conversion results in memory

without entering and exiting interrupt routines for

each data transfer.

A channel injection can be triggered by an event

on Capture/Compare CC31 (Port P7.7) of the

CAPCOM2 unit.

The dedicated output XADCINJ of the XTIMER

must be connected externally on the input P7.7/

CC31.

Due to the multiplexed inputs, at a time, the ADC

exclusively converts the Port5 inputs or the

XPort10 inputs. If one "y" channel has to be used

continuously in injection mode, it must be exter-

nally hardware connected to the Port5.y and

XPort10.y inputs.

The XTIMER peripheral is enabled by setting

XPEN bit 2 of the SYSCON register and bit 3 of

the new XPERCON register.

13.3.1 - Main Features

The XTIMER features are :

– 16 bits linear timer / 4 bits exponential prescaler

– Counting between 16 bits “start value” and 16

bits “end value”

– Counting period between 4 cycles and 2**33 cy-

cles (100 ns and 214s using 40MHz CPU clock)

– 1 trigger ouput (XADCINJ)

– Programmable functions :

• Internal clock XCLK is derivated from the CPU

clock and has the same period

• Up counting / down counting

• Reload enable

• Continue / stop modes

– 4 memory mapped registers :

• Control / prescaler

• Start value

• End value

• Current value

Table 22 : The Different Counting Modes

TLE

TCS

TCVR(n) = TEVR

TUD

TEN

TCVR(n+1)

comments

TCVR(n)

Timer disable

Stop

TCVR(n)-1

Decrement

Decrement (Continue)

TCVR(n)+1

Increment

Increment (Continue)

TSVR

Load

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