C8051F411-GMR Silicon Laboratories Inc, C8051F411-GMR Datasheet - Page 180

• Manufacturer Part Number: C8051F411-GMR
• Description: Microcontrollers (MCU) 50 MIPS 32KB 12ADC RTCLOCK 28 PIN MCU
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051F411-GMR

• Processor Series: C8051F4x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 32 KB
• Data Ram Size: 2.25 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 20
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F410DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 20 Channel
• On-chip Dac: 12 bit, 2 Channel
• Package: 28QFN EP
• Device Core: 8051
• Family Name: C8051F41x
• Maximum Speed: 50 MHz
• Ram Size: 2.25 KB
• Operating Supply Voltage: 1.8|2.5|3.3|5 V
• Operating Temperature: -40 to 85 °C
• Lead Free Status / Rohs Status: Details

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. 1.1
R/W
Bit3
R/W
Bit2
R/W
Bit1
SFR Address:
R/W
Bit0
0xAE
00000000
Reset Value