XC161CJ_02 Datasheet, PDF (38/78 Pages) Infineon Technologies AG – 16-Bi t Single-Chip Microcontroller Preliminary

XC161
Derivatives
Preliminary
Functional Description
3.8
Real Time Clock
The Real Time Clock (RTC) module of the XC161 is directly clocked via a separate clock
driver with the on-chip auxiliary oscillator frequency (f_RTC = f_OSCa). It is therefore
independent from the selected clock generation mode of the XC161.
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 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. Additionally, T14 can generate a separate node
request.
RUN
PRE
f_RTC
81
MUX
0
T14REL
CNT
INT0
10 Bits
Interrupt Sub Node
CNT
INT1
CNT
INT2
REL-Register
CNT
INT3
6 Bits
6 Bits
10 Bits
T14INT
RTCINT
T14
10 Bits
6 Bits
6 Bits
10 Bits
T14-Register
CNT-Register
mcb04805_xc.vsd
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
34
V1.0, 2002-03