XC2000 datasheet(40/729 Pages) INFINEON

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XC2000 Derivatives

Peripheral Units (Vol. 2 of 2)

The General Purpose Timer Units

Preliminary

User’s Manual

14-22

V1.0, 2007-06

GPT_X7, V2.0

Timer Concatenation

Using the toggle bit T3OTL as a clock source for an auxiliary timer in counter mode

concatenates the core timer T3 with the respective auxiliary timer. This concatenation

forms either a 32-bit or a 33-bit timer/counter, depending on which transition of T3OTL

is selected to clock the auxiliary timer.

• 32-bit Timer/Counter: If both a positive and a negative transition of T3OTL are used

to clock the auxiliary timer, this timer is clocked on every overflow/underflow of the

core timer T3. Thus, the two timers form a 32-bit timer.

• 33-bit Timer/Counter: If either a positive or a negative transition of T3OTL is selected

to clock the auxiliary timer, this timer is clocked on every second overflow/underflow

of the core timer T3. This configuration forms a 33-bit timer (16-bit core timer + T3OTL

+ 16-bit auxiliary timer).

As long as bit T3OTL is not modified by software, it represents the state of the internal

toggle latch, and can be regarded as part of the 33-bit timer.

The count directions of the two concatenated timers are not required to be the same.

This offers a wide variety of different configurations.

T3, which represents the low-order part of the concatenated timer, can operate in timer

mode, gated timer mode or counter mode in this case.

Figure 14-15 Concatenation of Core Timer T3 and an Auxiliary Timer

MCA05399

Toggle Latch

T3OUT

T3IRQ

Count

T3R

Core Timer T3

Operating

Mode

Control

BPS1

TxI

T3IN

GPT

Auxiliary

Timer Tx

TxI

MUX

TxI.2

TxIN

TxIRQ

Up/Down

Count

MUX

TxRC

TxR

T3R

x = 2, 4

Edge

Select

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