T410 datasheet(54/84 Pages) STMICROELECTRONICS

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ST52T410/ST52T420/E420

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Figure 10.4 PWM Mode with Auto Reload

LEVEL (Time Counter): If the T0STRT signal is

high the Timer starts counting. When T0STRT is

low the counting ceases and the current value is

stored in the PWM_0_COUNT Input Register.

EDGE(Period Counter): After reset, on the first

T0STRT rising edge, TIMER 0 starts counting and

at the next rising edge it stops. In this manner, the

period of an external signal may be measured.

Timer x output signal, TIMERxOUT is a signal with

a frequency equal to the 16 bit-Prescaler x output

signal, TMRCLKx, divided by the Output Register

PWM_x_COUNT value (8 bit) (Output Registers 3,

5 or 7. See Table 2.4), which is the value to count.

There can be two types of TIMERxOUT waveform:

type 1: TIMERxOUT waveform equal to a square

wave with a 50% duty-cycle.

type 2: TIMERxOUT waveform equal to a pulse

signal with the pulse duration equal to the

Prescaler x output signal.

For each Timer x, the TIMERxOUT waveform type

can be selected by setting the correspondent

TMRWx bit of REG_CONF6, REG_CONF9 and

REG_CONF11 registers (see Table 10.2, Table

10.5 and Table 10.7)

WARNING:

Timer

Mode

the

PWM_x_RELOAD output register (see below)

must be set to 0.

10.2 PWM Mode

For each timer, PWM working mode is obtained by

setting

the

correspondent

TxMODE

bits

REG_CONF5, REG_CONF8 and REG_CONF10

registers to 1 (see Table 10.1, Table 10.4 and

Table 10.6).

REMARK: The first period of the TxOUT signal

shorter than the other periods for a time

interval which is [0.5*TMRCLK-CLKM].

TIMERxOUT, in PWM Mode consists of a signal

with a fixed period, whose duty cycle can be

modified by the user.

The TIMERxOUT signal can be available on the

TxOUT pin and the TIMERxOUT inverted signal

canbeavailableon the TxOUT pin by setting the

PxSL bits of REG_CONF12 and REG_CONF16

(see Table 10.8 and Table 10.9)

255

compare

value

reload

PWM

Output

Ton

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