CD00001237 datasheet(47/105 Pages) STMICROELECTRONICS

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ST6215C ST6225C

47/105

9.2 8-BIT TIMER

9.2.1 Introduction

The 8-Bit Timer on-chip peripheral is a free run-

ning downcounter based on an 8-bit downcounter

with a 7-bit programmable prescaler, giving a max-

imum count of 215. The peripheral may be config-

ured in three different operating modes.

9.2.2 Main Features

■ Time-out downcounting mode with up to 15-bit

accuracy

■ External counter clock source (valid also in

STOP mode)

■ Interrupt capability on counter underflow

■ Output signal generation

■ External pulse length measurement

■ Event counter

The timer can be used in WAIT and STOP modes

to wake up the MCU.

Figure 27. Timer Block Diagram

INTERRUPT

TMZ

ETI

TOUT

DOUT

PSI

PS2

PS1

PS0

TSCR

PROGRAMMABLE PRESCALER

PSCR6 PSCR5 PSCR4 PSCR3 PSCR2 PSCR1 PSCR0

PSCR REGISTER

TCR7

TCR6

TCR5

TCR4

TCR3

TCR2

TCR1

TCR0

TCR

8-BIT DOWN COUNTER

TIMER

fPRESCALER

fCOUNTER

fEXT

fINT/12

LATCH

PSCR7

/16

/32

/64

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