ST92F124 datasheet(163/426 Pages) STMICROELECTRONICS

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STANDARD TIMER (STIM)

10.2 STANDARD TIMER (STIM)

10.2.1 Introduction

The Standard Timer includes a programmable 16-

bit down counter and an associated 8-bit prescaler

with Single and Continuous counting modes capa-

bility. The Standard Timer uses an output

(STOUT) pin. This pin may be independent pin or

connected as Alternate Function of an I/O port bit.

STOUT can be used to generate a Square Wave

or Pulse Width Modulated signal.

The Standard Timer is composed of a 16-bit down

counter with an 8-bit prescaler. The input clock to

the prescaler can be driven either by an internal

clock equal to INTCLK divided by 4, or by

CLOCK2/1024 derived directly from the external

oscillator, thus providing a stable time reference

independent from the PLL programming (refer to

Figure 90).

The Standard Timer End Of Count condition is

able to generate an interrupt which is connected to

one of the external interrupt channels.

The End of Count condition is defined as the

Counter Underflow, whenever 00h is reached.

Figure 90. Standard Timer Block Diagram

STOUT

EXTERNAL

INPUT

CLOCK CONTROL LOGIC

INEN INMD1 INMD2

STP

8-BIT PRESCALER

STH,STL

16-BIT

STANDARD TIMER

CLOCK

OUTMD1 OUTMD2

OUTPUT CONTROL LOGIC

INTERRUPT

CONTROL LOGIC

END OF

COUNT

INTS

INTERRUPT REQUEST

CLOCK2/

INTERRUPT

DOWNCOUNTER

INTCLK/4

MUX

1024

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