MSM7731-02 OKI [OKI electronic componets], MSM7731-02 Datasheet - Page 42

• Manufacturer Part Number: MSM7731-02
• Description: Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
• Manufacturer: OKI [OKI electronic componets]

METHOD OF INTERNAL DATA MEMORY ACCESS
The default values such as the cancelable echo delay time, echo attenuation and noise attenuation can be changed
during the initial mode (CR0-B1, CR0-B0 = “00”).
Refer to the procedure below.
After the write operation is complete, the write command (CR1-B7) is cleared to “0”. Consecutive writes are
possible.
(Example) In the case of changing the acoustic delay time in a single echo canceler mode to 30 ms.
1 Semiconductor
1. Set the address of the default value store memory. (CR6, 7)
2. Set the modified values (data). (CR8, 9)
3. Set the write command. (CR1-B7 = "1")
Address: 009Bh, Data: 00F0h
Set other memory?
CR7 = 9Bh
CR6 = 00h
CR8 = 00h
CR9 = F0h
CR1 = 80h
CR1 = 00h
START
END
No
Yes
No
Yes
Upper address setting
Lower address setting
Upper data setting
Lower data setting
Write control
Write complete confirmation
FEDL7731-02-04
MSM7731-02
42/53