SH33F2801PSLASH032PR datasheet(69/407 Pages) SINOWEALTH

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SH33F2801

10.3.12 HSI Oscillator Calibration Register (RCC_HSICAL)

Offset Address: 0x0034

Reset Value:

0xXXXX XX00

b31

b30

b29

b28

b27

b26

b25

b24

b23

b22

b21

b20

b19

b18

b17

b16

TRIMR

Reserved

TRIMREF[12:0]

b15

b14

b13

b12

b11

b10

HSICAL[7:0]

Reserved

HSITRIM[2:0]

Bit

Symbol

Description

TRIMRUN

HSI user adjustment switch, can only be set to 1 by software, and cleared

by hardware or software

0: The operation has ended or not started

1: Start HSI ADJ, the flag is 1 during the calculation, and the flag is cleared

by hardware after the calculation is completed.

Note: Allowing clearing RUN during the calculation to force the calculation to

end.

30 ~ 29

Reserved

28 ~ 16

TRIMREF[12:0]

HSI user calibration parameter value

After the RUN operation is completed, the user can read the HSI user

calibration parameter value from this register.

(HSI count HSE division source)

15 ~ 8

HSICAL[7:0]

Internal high frequency RC oscillator calibration

These bits are automatically initialized at system startup

7 ~ 3

Reserved

2 ~ 0

HSITRIM[2:0]

Internal high frequency RC oscillator adjustment

Write by software to adjust the HSI frequency, which are superimposed on the

HSICAL[7:0] value.

These bits are based on HSICAL[7:0], allowing the user to enter an adjustment

value to adjust the frequency of the internal HSI RC oscillator based on voltage

and temperature changes.

000: +0 (default)

001: +0.25%

010: +0.5%

011: +0.75%

100: -1%

101: -0.75%

110: -0.5%

111: -0.25%

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