CP2400DK Silicon Laboratories Inc, CP2400DK Datasheet - Page 72
CP2400DK
Manufacturer Part Number
CP2400DK
Description
KIT EVAL SPI LCD DRIVER CP2400
Manufacturer
Silicon Laboratories Inc
Specifications of CP2400DK
Main Purpose
LCD Development
Embedded
Yes
Utilized Ic / Part
CP2400
Primary Attributes
I²C, SMBus Interfaces
Secondary Attributes
Up to 128 segments
Product
Microcontroller Modules
Core Processor
C8051F930
Clock Speed
20 MHz
Interface Type
SPI
Timers
2
Operating Supply Voltage
1.8 V to 3.6 V
Cpu Core
C8051F930
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
336-1858
336-1858
336-1858
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CP2400/1/2/3
SFR Definition 11.1. RTCKEY: SmaRTClock Lock and Key
Address = 0x0A
72
Name
Reset
Type
Bit
7:0
Bit
RTC0ST
Name
7
0
SmaRTClock Interface Lock/Key and Status.
Locks/unlocks the SmaRTClock interface when written. Provides lock status when read.
Read:
0x00: SmaRTClock Interface is locked.
0x01: SmaRTClock Interface is locked.
First key code (0xA5) has been written, waiting for second key code.
0x02: SmaRTClock Interface is unlocked.
First and second key codes (0xA5, 0xF1) have been written.
0x03: SmaRTClock Interface is disabled until the next system reset.
Write:
When RTC0ST = 0x00 (locked), writing 0xA5 followed by 0xF1 unlocks the SmaRT-
Clock Interface.
When RTC0ST = 0x01 (waiting for second key code), writing any value other than the
second key code (0xF1) will change RTC0STATE to 0x03 and disable the SmaRTClock
Interface until the next system reset.
When RTC0ST = 0x02 (unlocked), any write to RTCKEY will lock the SmaRTClock
Interface.
When RTC0ST = 0x03 (disabled), writes to RTCKEY have no effect.
6
0
5
0
Rev. 1.0
4
0
RTC0ST[7:0]
R/W
Function
3
0
2
0
1
0
0
0
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