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參數(shù)資料
| 型號(hào)： | YSS901-F |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁(yè)數(shù)： | 15/17頁(yè) |
| 文件大小： | 158K |
| 代理商： | YSS901-F |
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YSS901
7
g Serial Microcomputer Interface
Format for writing data through microcomputer
After setting the address (A0 and A1) through SI, it is possible to write data (D0 to D7) into the specified address
when R/W bit has been set to “0”. The address map is as shown below.
Address
Data
Description
A1, A0
0
D0
CSEL0
D1
CSEL1
D2
CSEL2
D3
BSFT0
D4
BSFT1
D5 to D7
To be “0”.
0
1
D0
Write address selection
D1
Write address counter clear
D2
RAM clear
D3 to D7
To be “0”.
1
0
D7 to D0
Coefficient data to be written (higher byte)
1
D7 to D0
Coefficient data to be written (lower byte)
How to write coefficient data into RAM
Two coefficients are used as a set, each constituted with 16 bits x 125 taps.
The first coefficient (“coef1” shown in the block diagram) is written into RAM address 0-124, and the second one
(“coef2” shown in the block diagram) into RAM address 125-249.
The address counter for writing the data uses seven (7) bits, the upper bit (8th bit) uses “write address selection” of
D2 with A1, A0 = 0 1.
Data writing procedure
(1) Clear the RAM and write address counter. (RAM clear needs up to 2 fs to be completed.)
(2) When the RAM has been cleared, write data into higher byte and then into lower byte starting at the first
byte of the first coefficient. (When the writing into the lower byte has been completed, the data is actually
written into RAM. Wait 1 fs before writing the data into higher byte of the next coefficient.)
(3) When the first coefficient has been written, write the second one by using the same procedure. Set the
“write address selection” bit to “1” when writing data into the 4th tap and after of the second coefficient.
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