C8051T630DK Silicon Laboratories Inc, C8051T630DK Datasheet - Page 105
C8051T630DK
Manufacturer Part Number
C8051T630DK
Description
KIT DEV FOR C8051T630 FAMILY
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051T630DK
Contents
Board, daughter boards, power adapter, cables, documentation and software
Processor To Be Evaluated
C8051T63x
Interface Type
USB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051T630, T631, T632, T633, T634 and T635 MCUs
For Use With
336-1465 - BOARD SOCKET DAUGHTER 20-QFN
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1464
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19.3. Programmable Internal Low-Frequency (L-F) Oscillator
All C8051T630/1/2/3/4/5 devices include a programmable low-frequency internal oscillator, which is cali-
brated to a nominal frequency of 80 kHz. The low-frequency oscillator circuit includes a divider that can be
changed to divide the clock by 1, 2, 4, or 8, using the OSCLD bits in the OSCLCN register (see SFR Defi-
nition 19.4). Additionally, the OSCLF[3:0] bits can be used to adjust the oscillator’s output frequency.
19.3.1. Calibrating the Internal L-F Oscillator
Timers 2 and 3 include capture functions that can be used to capture the oscillator frequency, when run-
ning from a known time base. When either Timer 2 or Timer 3 is configured for L-F Oscillator Capture
Mode, a falling edge (Timer 2) or rising edge (Timer 3) of the low-frequency oscillator’s output will cause a
capture event on the corresponding timer. As a capture event occurs, the current timer value
(TMRnH:TMRnL) is copied into the timer reload registers (TMRnRLH:TMRnRLL). By recording the differ-
ence between two successive timer capture values, the low-frequency oscillator’s period can be calcu-
lated. The OSCLF bits can then be adjusted to produce the desired oscillator frequency.
SFR Definition 19.4. OSCLCN: Internal L-F Oscillator Control
SFR Address = 0xE3
Name
Reset
Bit
5:2
1:0
Type
7
6
Bit
OSCLD[1:0] Internal L-F Oscillator Divider Select.
OSCLF[3:0] Internal L-F Oscillator Frequency Control Bits.
OSCLRDY
OSCLEN
OSCLEN OSCLRDY
Name
R/W
7
0
Internal L-F Oscillator Enable.
0: Internal L-F Oscillator Disabled.
1: Internal L-F Oscillator Enabled.
Internal L-F Oscillator Ready.
0: Internal L-F Oscillator frequency not stabilized.
1: Internal L-F Oscillator frequency stabilized.
Note: OSCLRDY is only set back to 0 in the event of a device reset or a change to the
Fine-tune control bits for the Internal L-F oscillator frequency. When set to 0000b, the
L-F oscillator operates at its fastest setting. When set to 1111b, the L-F oscillator
operates at its slowest setting.
00: Divide by 8 selected.
01: Divide by 4 selected.
10: Divide by 2 selected.
11: Divide by 1 selected.
R
6
0
OSCLD[1:0] bits.
Varies
5
Varies
Rev. 1.0
4
OSCLF[3:0]
R.W
Function
Varies
3
C8051T630/1/2/3/4/5
Varies
2
1
0
OSCLD[1:0]
R/W
0
0
105
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