XC2000 datasheet(59/110 Pages) INFINEON

59 / 110 page

XC2287 / XC2286 / XC2285

XC2000 Family Derivatives

Functional Description

Preliminary

Data Sheet

V0.91, 2007-02

Draft Version

3.9

Real Time Clock

The Real Time Clock (RTC) module of the XC228x can be clocked with a selectable

clock signal from internal sources (oscillators or PLL) or external sources (pins).

The RTC basically consists of a chain of divider blocks:

•

Selectable 32:1 and 8:1 dividers (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 9

RTC Block Diagram

Note: The registers associated with the RTC are only affected by a power reset.

CNT-Register

REL-Register

10 Bits

6 Bits

10 Bits

T14

M CB05568B

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

MUX

REFCLK

XC2000 Datasheet(PDF) 59 Page - Infineon Technologies AG

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