
ST52F510/F513/F514
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(*) Values by design (not characterized)
Internal Oscillator Calibration (OSC_SET)
Option Byte 2 (02h)
Reset Value: 0000 0000 (00h)
Bit 7-6: Not Used
Bit 5-0:
OSPAR5-0
Internal Oscillator Parameters
These bitsare used in order to calibrate the
precision of the internal oscillator working
at 10 MHz. The six bits enable some
current generators with steps of 5
μ
A
corresponding to interval of frequency of
100KHz
.
Warning:
allowed is101000 (40). The value coresponding to
the 10MHz by design is 010100 (20).
the
maximum
configuration
value
PLVD Control Register (PLVD_CR)
Option Byte 3 (03h)
Reset Value: 0000 0000 (00h)
Bit 7-2: Not Used
Bit 1-0:
PLVD1-0
PLVD detection levels
00: PLVD disabled
01: Lowest detection level
10: Medium detection level
11: Highest detection level
Wake-Up Time Prescaler (WAKEUP)
Option Byte 7 (07h)
Reset Value: 0000 0000 (00h)
Bit 7-0:
WK7-0
Wake-up prescaler
This byte determinates the time delay for
the stabilization of the oscillator after an
External Reset or a POR and after the
wake-up from Halt. The time delay is
computed
according
formula:
to
the
following
Warning:
allowed. If the internal clock is used as clock
source the prescaler is not used.
Table 6.2 Recomended Gains for the most common frequencies
Frequency
Recommend
Gain Stages
CKPAR2-0
Oscillation
Start Times*
Settling Times for
40%-60% duty-cycle*
External Clock
0
000
-
-
5 MHz
1
001
100
μ
s
110
μ
s
10 MHz
3
011
80
μ
s
85
μ
s
20 MHz
6
111
133
μ
s
143
μ
s
7
0
-
-
OSPAR5 OSPAR4 OSPAR3 OSPAR2 OSPAR1 OSPAR0
7
0
-
-
-
-
-
-
PLVD1
PLVD0
7
0
WK7
WK6
WK5
WK4
WK3
WK2
WK1
WK0
Delay
4096
WAKEUP
1
+
(
)
Tclk
×
×
=