XC2287 / XC2286 / XC2285
XC2000 Family Derivatives
Preliminary
Functional Description
3.9
Real Time Clock
The Real Time Clock (RTC) module of the XC228x can be clocked with a selectable
clock signal from internal sources (oscillators or PLL) or external sources (pins).
The RTC basically consists of a chain of divider blocks:
•
•
•
Selectable 32:1 and 8:1 dividers (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.
fRTC
MUX
:
32
RUN
RTCINT
MUX
Interrupt Sub Node
: 8
CNT
INT0
CNT
INT1
CNT
INT2
CNT
INT3
PRE
REFCLK
REL-Register
T14REL
10 Bits
6 Bits
6 Bits
10 Bits
fCNT
T14
10 Bits
6 Bits
6 Bits
10 Bits
T14-Register
CNT-Register
MCB05568B
Figure 9
RTC Block Diagram
Note: The registers associated with the RTC are only affected by a power reset.
Data Sheet
57
V0.91, 2007-02
Draft Version
INFINEON [ Infineon ]
