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C161 Datasheet(PDF) 269 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 269 Page - Infineon Technologies AG |
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269 / 400 page  &3, 7KH5HDO 7LPH &ORFN User’s Manual 14-1 1999-08 14 The Real Time Clock The Real Time Clock (RTC) module of the C161PI 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 C161PI 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. Register Name Long/Short Address Reset Value Notes T14 F0D2 H / 69H UUUU H Prescaler timer, generates input clock for RTC register and periodic interrupt T14REL F0D0 H / 68H UUUU H Timer reload register RTCH F0D6 H / 6BH UUUU H High word of RTC register RTCL F0D4 H / 6AH UUUU H Low word of RTC register SYSCON2Power Management Control Register T14REL Timer T14 Reload Register T14 Timer T14 Count Register T14 E RTCH Real Time Clock Register, High Word RTCL Real Time Clock Register, Low Word ISNC Interrupt Subnode Control Register XP3IC RTC Interrupt Control Register Data Registers Counter Registers Interrupt Control XP3IC E RTCH E ISNC E T14REL E RTCL E Control Registers SYSCON2E |
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