C8051F411-GMR Silicon Laboratories Inc, C8051F411-GMR Datasheet - Page 182
C8051F411-GMR
Manufacturer Part Number
C8051F411-GMR
Description
Microcontrollers (MCU) 50 MIPS 32KB 12ADC RTCLOCK 28 PIN MCU
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F410DK.pdf
(270 pages)
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
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C8051F410/1/2/3
20.2. smaRTClock Clocking Sources
The smaRTClock peripheral is clocked from its own timebase, independent of SYSCLK. The RTCCLK
timebase is derived from the smaRTClock oscillator circuit. This oscillator has two modes of operation:
Crystal Mode, and Self-Oscillate Mode. The oscillation frequency is 32.768 kHz in Crystal Mode and can
be configured to roughly 20 kHz or 40 kHz in Self-Oscillate Mode. The frequency of the smaRTClock oscil-
lator can be measured with respect to another oscillator using Timer 2 or Timer 3. Section
“
Note: The smaRTClock clock can be selected as system clock and routed to a port pin. See SFR
Definition 19.5. “CLKSEL: Clock Select” on page 174 and Section “
20.2.1. Using the smaRTClock Oscillator in Crystal Mode
When using Crystal Mode, a 32.768 kHz crystal should be connected between XTAL3 and XTAL4. No
other external components are required. The following steps show how to start the smaRTClock crystal
oscillator in software:
20.2.2. Using the smaRTClock Oscillator in Self-Oscillate Mode
When using Self-Oscillate Mode, the XTAL3 and XTAL4 pins should be shorted together. The following
steps show how to configure smaRTClock for use in Self-Oscillate Mode:
182
24.2.3. External/smaRTClock Capture Mode
Note: Software should avoid read modify write instructions when writing values to RTC0DAT.
Bits 7–0: RTC0DAT. smaRTClock Data Bits
R/W
Bit7
Step 1. Set smaRTClock to Crystal Mode (XMODE = 1).
Step 2. Optional. Enable Automatic Gain Control (AGCEN = 1).
Step 3. Optional. Enable smaRTClock Bias Doubling (BIASX2 = 1).
Step 4. Enable power to the smaRTClock oscillator circuit (RTC0EN = 1).
Step 5. Poll the smaRTClock Clock Valid Bit (CLKVLD) until the crystal oscillator stabilizes.
Step 6. Optional . Clear BIASX2 to ‘0’ after the oscillator stabilizes to conserve power.
Step 1. Set smaRTClock to Self-Oscillate Mode (XMODE = 0).
Step 2. Set the desired oscillation frequency:
Step 3. The oscillator starts oscillating instantaneously.
Holds data transferred to/from the internal smaRTClock register selected by RTC0ADR.
For oscillation at about 20 kHz, set BIASX2 = 0.
For oscillation at about 40 kHz, set BIASX2 = 1.
R/W
Bit6
SFR Definition 20.3. RTC0DAT: smaRTClock Data
R/W
Bit5
R/W
Bit4
” on page
Rev. 1.1
R/W
Bit3
241
shows how this can be accomplished.
R/W
Bit2
18. Port Input/Output
R/W
Bit1
SFR Address:
R/W
Bit0
” on page
0xAD
Reset Value
Variable
147
.
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