C161CS-32R Datasheet, PDF (33/89 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller

C161CS/JC/JI-32R
C161CS/JC/JI-L
Real Time Clock
The Real Time Clock (RTC) module of the C161CS/JC/JI 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). The RTC module is directly clocked via a
separate clock driver with the on-chip main oscillator frequency divided by 32
(f_RTC = f_OSCm / 32) or with the on-chip auxiliary oscillator frequency (f_RTC = f_OSCa). It is
therefore independent from the selected clock generation mode of the C161CS/JC/JI.
All timers count up.
The RTC module can be used for different purposes:
• System clock to determine the current time and date
• Cyclic time based interrupt
• 48-bit timer for long term measurements
T14REL
Reload
T14
RTCH
8:1
RTCL
f _RTC
Interrupt
Request
MCD04432
Figure 8 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.
Data Sheet
29
V3.0, 2001-01