XC2000 datasheet(44/729 Pages) INFINEON

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XC2000 Derivatives

Peripheral Units (Vol. 2 of 2)

The General Purpose Timer Units

Preliminary

User’s Manual

14-26

V1.0, 2007-06

GPT_X7, V2.0

Auxiliary Timer in Capture Mode

Capture mode for an auxiliary timer Tx is selected by setting bitfield TxM in the respective

B. In capture mode, the contents of the core timer T3 are latched

into an auxiliary timer register in response to a signal transition at the respective auxiliary

timer’s external input pin TxIN. The capture trigger signal can be a positive, a negative,

or both a positive and a negative transition.

The two least significant bits of bitfield TxI select the active transition (see Table 14-5).

Bit 2 of TxI is irrelevant for capture mode and must be cleared (TxI.2 = 0).

Note: When programmed for capture mode, the respective auxiliary timer (T2 or T4)

stops independently of its run flag T2R or T4R.

Figure 14-18 GPT1 Auxiliary Timer in Capture Mode

Upon a trigger (selected transition) at the corresponding input pin TxIN the contents of

the core timer are loaded into the auxiliary timer register and the associated interrupt

request flag TxIR will be set.

For capture mode operation, the respective timer input pin TxIN must be configured as

input. To ensure that a transition of the capture input signal applied to TxIN is recognized

correctly, its level must be held high or low for a minimum number of module clock

cycles, detailed in Section 14.1.5.

MCA05402

Toggle Latch

T3OUT

T3IRQ

Count

T3R

Core Timer T3

Operating

Mode

Control

BPS1

T3I

Up/Down

T3IN

GPT

Auxiliary

Timer Tx

TxI

Capture

TxIN

TxIRQ

x = 2, 4

y = 4, 2

to Ty

Edge

Select

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