c8051f410 Silicon Laboratories, c8051f410 Datasheet - Page 180
c8051f410
Manufacturer Part Number
c8051f410
Description
2.0 V, 32/16 Kb Flash, Smartclock, 12-bit Adc
Manufacturer
Silicon Laboratories
Datasheet
1.C8051F410.pdf
(270 pages)
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C8051F410/1/2/3
180
Bits 7–0: RTC0STATE. smaRTClock State Bits
R/W
Bit7
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 RTC0STATE = 0x00 (locked), writing 0xA5 followed by 0xF1 unlocks the smaRTClock
Interface.
When RTC0STATE = 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 RTC0STATE = 0x02 (unlocked), any write to RTC0KEY will lock the smaRTClock
Interface.
When RTC0STATE = 0x03 (disabled), writes to RTC0KEY have no effect.
SFR Definition 20.1. RTC0KEY: smaRTClock Lock and Key
R/W
Bit6
R/W
Bit5
R/W
Bit4
Rev. 1.0
R/W
Bit3
R/W
Bit2
R/W
Bit1
SFR Address:
R/W
Bit0
0xAE
00000000
Reset Value
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