XC161CS-32F datasheet(41/84 Pages) INFINEON

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XC161-32

Derivatives

Functional Description

Data Sheet

V1.0, 2004-11

3.8

Real Time Clock

The Real Time Clock (RTC) module of the XC161 is directly clocked via a separate clock

driver either with the on-chip auxiliary oscillator frequency (

RTC = fOSCa) or with the

prescaled on-chip main oscillator frequency (

RTC = fOSCm/32). It is therefore independent

from the selected clock generation mode of the XC161.

The RTC basically consists of a chain of divider blocks:

•

a selectable 8:1 divider (on - off)

•

the reloadable 16-bit timer T14

•

the 32-bit RTC timer block (accessible via registers RTCH and RTCL), made of:

– a reloadable 10-bit timer

– a reloadable 6-bit timer

– a reloadable 10-bit timer

All timers count up. Each timer can generate an interrupt request. All requests are

combined to a common node request.

Figure 8

RTC Block Diagram

Note: The registers associated with the RTC are not affected by a reset in order to

maintain the correct system time even when intermediate resets are executed.

CNT-Register

REL-Register

10 Bits

6 Bits

10 Bits

T14

MCB05568

T14-Register

Interrupt Sub Node

RTCINT

MUX

PRE

RUN

CNT

INT3

CNT

INT2

CNT

INT1

CNT

INT0

CNT

RTC

T14REL

10 Bits

6 Bits

10 Bits

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