Reset and clock control (RCC) RM0367
190/1043 RM0367 Rev 7
7.3.2 Internal clock sources calibration register (RCC_ICSCR)
Address offset: 0x04
Reset value: 0x00XX B0XX where X is undefined.
Access: no wait state, word, half-word and byte access
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
MSITRIM[7:0] MSICAL[7:0]
rw rw rw rw rw rw rw rw r r r r r r r r
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
MSIRANGE[2:0] HSI16TRIM[4:0] HSI16CAL[7:0]
rw rw rw rw rw rw rw rw r r r r r r r r
Bits 31:24 MSITRIM[7:0]: MSI clock trimming
These bits are set by software to adjust MSI calibration.
These bits provide an additional user-programmable trimming value that is added to the
MSICAL[7:0] bits. They can be programmed to compensate for the variations in voltage and
temperature that influence the frequency of the internal MSI RC.
Bits 23:16 MSICAL[7:0]: MSI clock calibration
These bits are automatically initialized at startup.
Bits 15:13 MSIRANGE[2:0]: MSI clock ranges
These bits are set by software to choose the frequency range of MSI.7 frequency ranges are
available:
000: range 0 around 65.536 kHz
001: range 1 around 131.072 kHz
010: range 2 around 262.144 kHz
011: range 3 around 524.288 kHz
100: range 4 around 1.048 MHz
101: range 5 around 2.097 MHz (reset value)
110: range 6 around 4.194 MHz
111: not allowed
Bits 12:8 HSI16TRIM[4:0]: High speed internal clock trimming
These bits provide an additional user-programmable trimming value that is added to the
HSI16CAL[7:0] bits. They can be programmed to compensated for the variations in voltage
and temperature that influence the frequency of the internal HSI16 RC.
Bits 7:0 HSI16CAL[7:0] Internal high speed clock calibration
These bits are initialized automatically at startup.
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