XC2000 datasheet(79/729 Pages) INFINEON

79 / 729 page

XC2000 Derivatives

Peripheral Units (Vol. 2 of 2)

Real Time Clock

Preliminary

User’s Manual

15-1

V1.0, 2007-06

RTC_X8, V2.1

Real Time Clock

The Real Time Clock (RTC) module of the XC2000 basically consists of a chain of

prescalers and timers. Its count clock is derived from the auxiliary oscillator or from the

prescaled main oscillator. The RTC serves various purposes:

•

48-bit timer for long term measurements

•

System clock to determine the current time and date

(the RTC’s structure supports the direct representation of time and date)

•

Cyclic time based interrupt (can be generated by any timer of the chain)

A number of programming options as well as interrupt request signals adjust the

operation of the RTC to the application’s requirements. The RTC can continue its

operation while the XC2000 is in certain power-saving modes, such that real time date

and time information is provided.

Figure 15-1

SFRs Associated with the RTC Module

The RTC module consists of a chain of 3 divider blocks:

•

a selectable 8:1 divider (on - off)

•

the reloadable 16-bit timer T14

•

the 32-bit RTC timer block (accessible via RTC_RTCH and RTC_RTCL), made of:

– the reloadable 10-bit timer CNT0

– the reloadable 6-bit timer CNT1

– the reloadable 6-bit timer CNT2

– the reloadable 10-bit timer CNT3

All timers count upwards. Each of the five timers can generate an interrupt request. All

requests are combined to a common node request.

Note: The RTC registers are not affected by a functional reset in order to maintain the

correct system time even when intermediate resets are executed.

m c_rt cregx2k. vsd

Data Registers

Counter Registers

RTC_T14

Interrupt Control

RTC_CON

Real Tim e Clock Control Register

RTCCLKCON

RTC Clock Control Register

RTC_ISNC

Interrupt Subnode Control Reg.

RTC_IC

RTC Interrupt Control Register

RTC_T14REL E

RTC_RELH

RTC_ISNC

RTC_IC

RTC_RELL

T2CON

RTC_RTCL

RTC_RTCH

Control Registers

RTC_CON

RTCCLKCON

RTC_T14

Tim er T14 Count Register

RTC_T14REL

Tim er T14 Reload Register

RTC_RTCH/L

RTC Count Registers, High/Low

RTC_RELH/L

RTC Reload Registers High/Low

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