XC164CS Datasheet, PDF (36/71 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller

XC164
Derivatives
Functional Description
3.9
Real Time Clock
The Real Time Clock (RTC) module of the XC164 is directly clocked via a separate clock
driver with the prescaled on-chip oscillator frequency (f_RTC = f_OSC / 32). It is therefore
independent from the selected clock generation mode of the XC164.
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.
RUN
PRE
f_RTC
8
1
MUX
0
T14REL
CNT
IN T 0
10 Bits
Interrupt Sub Node
CNT
IN T 1
CNT
IN T 2
R E L -R e g is te r
CNT
IN T3
6 Bits
6 Bits
10 B its
R T C IN T
T14
10 Bits
6 Bits
6 Bits
10 B its
T 1 4 -R e g is te r
CNT-Register
m c b04805_x c.v s d
Figure 9 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
32
V2.1, 2003-06