XC164CS datasheet(36/71 Pages) INFINEON

36 / 71 page

XC164

Derivatives

Functional Description

Data Sheet

V2.1, 2003-06

3.9

Real Time Clock

The Real Time Clock (RTC) module of the XC164 is directly clocked via a separate clock

driver with the prescaled on-chip oscillator frequency (

fRTC = fOSC / 32). It is therefore

independent from the selected clock generation mode of the XC164.

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 9

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.

m c b04805_x c.v s d

T14R E L

T14

T14-R egister

C N T -R eg ister

REL -Reg ister

10 B its

6 B its

10 B its

6 B its

10 B its

Inte rru p t S u b N o d e

CNT

IN T 0

CNT

IN T 1

CNT

IN T 2

CNT

IN T3

RT CINT

RUN

PR E

RT C

MU X

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