STA321MP datasheet(42/50 Pages) STMICROELECTRONICS

42 / 50 page

Registers

STA321MP

42/50

Doc ID 022647 Rev 1

7.5

Writing a single coefficient to RAM

Write the top 2 bits of the address to I2C register 0x3B

Write the bottom 8 bits of the address to I2C register 0x3C

Write the top 8 bits of the coefficient in I2C address 0x3D

Write the middle 8 bits of the coefficient in I2C address 0x3E

Write the bottom 8 bits of the coefficient in I2C address 0x3F

Write 1 to the W1 bit in I2C address 0x4C

7.6

Writing a set of coefficients to RAM

Write the top 2 bits of the starting address to I2C register 0x3B

Write the bottom 8 bits of the starting address to I2C register 0x3C

Write the top 8 bits of coefficient b1 in I2C address 0x3D

Write the middle 8 bits of coefficient b1 in I2C address 0x3E

Write the bottom 8 bits of coefficient b1 in I2C address 0x3F

Write the top 8 bits of coefficient b2 in I2C address 0x40

Write the middle 8 bits of coefficient b2 in I2C address 0x41

Write the bottom 8 bits of coefficient b2 in I2C address 0x42

Write the top 8 bits of coefficient a1 in I2C address 0x43

10. Write the middle 8 bits of coefficient a1 in I2C address 0x44

11. Write the bottom 8 bits of coefficient a1 in I2C address 0x45

12. Write the top 8 bits of coefficient a2 in I2C address 0x46

13. Write the middle 8 bits of coefficient a2 in I2C address 0x47

14. Write the bottom 8 bits of coefficient a2 in I2C address 0x48

15. Write the top 8 bits of coefficient b0 in I2C address 0x49

16. Write the middle 8 bits of coefficient b0 in I2C address 0x4A

17. Write the bottom 8 bits of coefficient b0 in I2C address 0x4B

18. Write 1 to the WA bit in I2C address 0x4C

The mechanism for writing a set of coefficients to RAM provides a method of updating the

five coefficients corresponding to a given biquad (filter) simultaneously to avoid possible

unpleasant acoustic side-effects.

When using this technique, the 10-bit address specifies the address of the biquad b1

coefficient (for example, decimals 0, 5, 10, 15, …, 100, … 395), and the STA321MP will

generate the RAM addresses as offsets from this base value to write the complete set of

coefficient data.

STA321MP 数据表(PDF) 42 Page - STMicroelectronics

STA321MP 数据表(HTML) 42 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

数据表下载