C167CS datasheet(307/517 Pages) INFINEON

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C167CS

Derivatives

The Real Time Clock

User’s Manual

14-1

V2.0, 2000-07

The Real Time Clock

The Real Time Clock (RTC) module of the C167CS basically is an independent timer

chain which is clocked directly with the oscillator clock and serves for different purposes:

• System clock to determine the current time and date

• Cyclic time based interrupt

• 48-bit timer for long term measurements

Figure 14-1

SFRs Associated with the RTC Module

The RTC module consists of a chain of 3 divider blocks, a fixed 8:1 divider, the reloadable

16-bit timer T14 and the 32-bit RTC timer (accessible via registers RTCH and RTCL).

Both timers count up.

The clock signal for the RTC module is directly derived from the on-chip oscillator

frequency (not from the CPU clock) and fed through a separate clock driver. It is

therefore independent from the selected clock generation mode of the C167CS and is

controlled by the clock generation circuitry.

Note: The RTC registers are not affected by a reset. After a power on reset, however,

they are undefined.

Table 14-1

RTC Register Location within the ESFR space.

Name

Long / Short

Address

Reset

Value

Notes

T14

F0D2H / 69H

UUUUH

Prescaler timer, generates input clock

for RTC register and periodic interrupt

T14REL

F0D0H / 68H

UUUUH

Timer reload register

RTCH

F0D6H / 6BH

UUUUH

High word of RTC register

RTCL

F0D4H / 6AH

UUUUH

Low word of RTC register

MCA04463

SYSCON2

T14REL

T14

ISNC

Control Registers

Data Registers

Counter Registers

Interrupt Control

RTCH

Real Time Clock Register, High Word

RTCL

Real Time Clock Register, Low Word

ISNC

Interrupt Subnode Control Register

XP3IC

RTC Interrupt Control Register

XP3IC

RTCH

RTCL

SYSCON2

Power Management Control Register

T14REL

Timer T14 Reload Register

T14

Timer T14 Count Register

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