ST52T430 datasheet(52/88 Pages) STMICROELECTRONICS

52 / 88 page

ST52T430/E430

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Figure 10.4 PWM Mode with Auto Reload

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)

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).

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

can be available on the TxOUT pin by setting the

PxSL bits of REG_CONF12 and REG_CONF16

(see Table 10.8 and Table 10.9)

The PWM TIMERxOUT period can be determined

by setting the 16-bit prescaler x output and an

initial autoreload 8-bit counter value stored in the

Output Register PWM_x_RELOAD, as illustrated

in Figure 10.4.

NOTE: the Start/Stop and Set/Reset signals

should be moved together in PWM mode. If the

Start/Stop bit is reset during the PWM mode

working, the TxOUT signal keeps its status

until the next start.

255

compare

value

reload

PWM

Output

Ton

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