CP2400 SILABS [Silicon Laboratories], CP2400 Datasheet - Page 32

• Manufacturer Part Number: CP2400
• Description: 128/64 SEGMENT LCD DRIVER
• Manufacturer: SILABS [Silicon Laboratories]

CP2400/1/2/3
5.
CP2400/1/2/3 devices include a 20 MHz internal oscillator that is selected as the system clock source upon reset.
Additional clocking options include an external CMOS clock input, the internal oscillator divided by 2, 4, or 8, and
the SmaRTClock real time clock oscillator. The system clock source is selected using the CLKSEL register. The
system clock selection may always be overridden by an external CMOS clock if the CLKOVR bit (MSCN.2) is set.
SFR Definition 5.1. CLKSL: Clock Select
Internal Register Address = 0x32
32
Name
Reset
Type
Bit
7:3
2:0
Bit
Clocking Options
CM O S
Clock
Unused
CLKSL
Name
R/W
32.768 kHz
7
0
XTAL1
XTAL2
CLK
Read = 00000. Write = Don’t Care.
System Clock Select.
Selects the oscillator to be used as system clock source.
000: Internal oscillator divided by 1.
001: Internal oscillator divided by 2.
010: Internal oscillator divided by 4.
011: Internal oscillator divided by 8.
100: CMOS clock (CLK pin).
101: SmaRTClock oscillator.
All other values reserved.
R/W
6
0
20 M Hz Internal
Sm aRTClock
O scillator
O scillator
R/W
Figure 5.1. Clocking Options
5
0
Rev. 1.0
R/W
8
4
2
4
0
Function
R/W
3
0
CLKSEL
2
0
CM O S
Clock
M SC N
CLKSL
R/W
1
0
SYSCLK
0
0