C167CS datasheet(233/517 Pages) INFINEON

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C167CS

Derivatives

The General Purpose Timer Units

User’s Manual

10-5

V2.0, 2000-07

Timer 3 Output Toggle Latch

An overflow or underflow of timer T3 will clock the toggle bit T3OTL in control register

T3CON. T3OTL can also be set or reset by software. Bit T3OE (Alternate Output

Function Enable) in register T3CON enables the state of T3OTL to be an alternate

function of the external output pin T3OUT. For that purpose, a ‘1’ must be written into the

respective port data latch and pin T3OUT must be configured as output by setting the

corresponding direction control bit to ‘1’. If T3OE = ‘1’, pin T3OUT then outputs the state

of T3OTL. If T3OE = ‘0’, pin T3OUT can be used as general purpose IO pin.

In addition, T3OTL can be used in conjunction with the timer over/underflows as an input

for the counter function or as a trigger source for the reload function of the auxiliary

timers T2 and T4. For this purpose, the state of T3OTL does not have to be available at

pin T3OUT, because an internal connection is provided for this option.

Timer 3 in Timer Mode

Timer mode for the core timer T3 is selected by setting bit field T3M in register T3CON

to ‘000B’. In this mode, T3 is clocked with the internal system clock (CPU clock) divided

by a programmable prescaler, which is selected by bit field T3I. The input frequency

fT3

for timer T3 and its resolution

rT3 are scaled linearly with lower clock frequencies fCPU,

as can be seen from the following formula:

Figure 10-3

Block Diagram of Core Timer T3 in Timer Mode

fT3 =

fCPU

× 2<T3I>

rT3 [µs] =

fCPU [MHz]

× 2<T3I>

Core Timer Tx

TxOTL

Interrupt

Request

TxOE

TxOUT

TxR

2n : 1

Txl

EXOR

MUX

TxEUD

TxUDE

MCB02028

TxUD

CPU

Up/

Down

T3EUD = P3.4

x = 3

T3OUT = P3.3

n = 3 … 10

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