SAK-C505L Infineon Technologies AG, SAK-C505L Datasheet - Page 41

• Manufacturer Part Number: SAK-C505L
• Description: 8-bit CMOS Microcontroller
• Manufacturer: Infineon Technologies AG

Real-Time Clock
The real-time clock unit of the C505L contains a dedicated oscillator and a 47-bit timer which is used
to count time elapsed with respect to an initial time. The C505L real-time clock does not provide for
any error correction. Any such corrections can be done by software only.
Functionality
The real-time clock can be initialized to a 40-bit initial value, which are loaded into the upper 40-bits
of the timer. The lower 7 bits of the counter are never accessible by the user and merely act as
prescalers that are initialized to 0000000
increment of the clock register is made for every cycle of the input clock (32.768 kHz). The
functionality of the real-time clock is shown in Figure 18.
Figure 18
Real-Time Clock
The register memory for the real-time clock is implemented in the on-chip external data memory
area. Accesses to these registers are similar to on-chip XRAM accesses (MOVX instructions) and
therefore must be preceded by an enable operation on the on-chip XRAM. These registers include
the RTCON, RTCR0 to RTCR4 (RTCR), CLREG0 to CLREG4 (CLREG) and RTINT0 to RTINT4
(RTINT) registers.
Data Sheet
32.768 KHz
Input
OSC.
These bits are not readable.
Control
RTCS
Bit 0
ERTC
7-Bit Timer
Bit 6
LSB
B
after a start operation on the real-time clock. One
RTCR, 40-Bit Register
40-Bit Comparator
RTINT, 40-Bit Register
CLREG, 40-Bit Timer
39
MCS03865
MSB
IRTC
Wake - up
Request
C505L
06.99