C8051F930-GQ Silicon Laboratories Inc, C8051F930-GQ Datasheet - Page 208

• Manufacturer Part Number: C8051F930-GQ
• Description: IC 8051 MCU 64K FLASH 32-LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F9xxr

Specifications of C8051F930-GQ

• Program Memory Type: FLASH
• Program Memory Size: 64KB (64K x 8)
• Package / Case: 32-LQFP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 24
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 3.6 V
• Data Converters: A/D 23x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F9x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 4.25 KB
• Interface Type: I2C/SMBus/SPI/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 4
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F930DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 23-ch x 10-bit
• No. Of I/o's: 24
• Ram Memory Size: 4KB
• Cpu Speed: 25MHz
• No. Of Timers: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1478 - PLATFORM PROG TOOLSTCK F920,F930336-1477 - PLATFORM PROG TOOLSTCK F920,F930336-1473 - KIT DEV C8051F920,F921,F930,F931336-1472 - BOARD TARGET/PROTO W/C8051F930
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1466

C8051F93x-C8051F92x
Internal Register Definition 20.4. RTC0CN: SmaRTClock Control
SmaRTClock Address = 0x04
208
Note: The ALRM flag will remain asserted for a maximum of one SmaRTClock cycle. See Section “Power
Reset
Name
Type
Bit
7
6
5
4
3
2
1
0
Bit
RTC0AEN SmaRTClock Alarm Enable.
RTC0CAP SmaRTClock Timer Capture.
RTC0SET SmaRTClock Timer Set.
Management” on page 156 for information on how to capture a SmaRTClock Alarm event using a flag which
is not automatically cleared by hardware.
MCLKEN Missing SmaRTClock Detector Enable.
OSCFAIL SmaRTClock Oscillator Fail Event Flag.
RTC0EN SmaRTClock Enable.
RTC0TR SmaRTClock Timer Run Control.
Name
ALRM
RTC0EN
R/W
7
0
Enables/disables the SmaRTClock oscillator and associated bias currents.
0: SmaRTClock oscillator disabled.
1: SmaRTClock oscillator enabled.
Enables/disables the missing SmaRTClock detector.
0: Missing SmaRTClock detector disabled.
1: Missing SmaRTClock detector enabled.
Set by hardware when a missing SmaRTClock detector timeout occurs. Must be
cleared by software. The value of this bit is not defined when the SmaRTClock 
oscillator is disabled.
Controls if the SmaRTClock timer is running or stopped (holds current value).
0: SmaRTClock timer is stopped.
1: SmaRTClock timer is running.
Enables/disables the SmaRTClock alarm function. Also clears the ALRM flag.
0: SmaRTClock alarm disabled.
1: SmaRTClock alarm enabled.
SmaRTClock Alarm Event
Flag and Auto Reset
Enable
Reads return the state of the
alarm event flag.
Writes enable/disable the 
Auto Reset function.
Writing 1 initiates a SmaRTClock timer set operation. This bit is cleared to 0 by hard-
ware to indicate that the timer set operation is complete.
Writing 1 initiates a SmaRTClock timer capture operation. This bit is cleared to 0 by
hardware to indicate that the timer capture operation is complete.
MCLKEN
R/W
0
6
OSCFAIL
Varies
R/W
5
RTC0TR
R/W
Rev. 1.1
Read:
0: SmaRTClock alarm
event flag is de-asserted.
1: SmaRTClock alarm
event flag is asserted.
4
0
Function
RTC0AEN
R/W
3
0
ALRM
R/W
2
0
Write:
0: Disable Auto Reset.
1: Enable Auto Reset.
RTC0SET RTC0CAP
R/W
1
0
R/W
0
0