Cmsemicon CMS32L051 - Real-Time Clock Selection Register (RTCCL)

V1.2.2
CMS32L051 User Manual |Chapter 7 Real-Time Clock
www.mcu.com.cn 224 / 703
7.3.2 Real-time clock selection register (RTCCL)
The real-time clock and the count clock (fRTC) of the 15-bit interval timer can be selected via RTCCL.
Figure 7-3 Format of real-time clock selection register (RTCCL)
Address: 0x4004047C After reset: 00H R/W
Symbol
7 6 5 4 3 2 1
0
RTCCL
RTCCL7
Selection of clock source for real time clock, counting clock of 15-bit interval timer
0
Select the high-speed system clock (fMX).
1
Select the high-speed internal oscillator (fhoco).
RTCCKS1
RTCCKS0
RTCCL6
RTCCL5
Selection of running clock for real time clock,
counting clock of 15-bit interval timer
0
0
x
x
Subsystem clock (f
SUB
).
0
1
Low-speed internal oscillator clock (f
IL
)
(WUTMMCK0 must be set to 1).
1
0
0
1
Master clock fmax/fhoco (selected via
RTCCL7)/1952
1
0
0
0
Master clock fmax/fhoco (selected via
RTCCL7)/1464
1
0
1
0
Master clock fmax/fhoco (selected via
RTCCL7)/976
1
1
0
0
Master clock fmax/fhoco (selected via
RTCCL7)/488
1
1
1
0
Master clock fmax/fhoco (selected via
RTCCL7)/244
RTCCL7
RTCCL6
RTCCL5
0
0
0
RTCCKS1
RTCCKS0
0