AK7750 Datasheet, PDF (55/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
f) Hands-Free Parameter RAM Write (at reset)
Hands-Free Parameter RAM Write operations (at reset) are executed in 4 bytes/set data.
When all data is transferred, the RDY pin becomes “L”. It becomes “H” after writing into Hands-Free
Parameter RAM is completed and next data can be input.
When writing data at the consecutive address locations, input data as is. When writing data at the
discontinuous address locations, input command code first, then address and data in this order after setting
RQ-N pin from “H” to “L”.
Data transfer procedure
c Command code
d Address
e Data
f Data
E0h ( 1 1 1 0 0 1 0 0)
( 0 0 A5 . . . . A0)
(D15 . . . . . . D8)
(D7 . . . . . . D0)
S_RESET
RQ
SCLK
SI
RDY
SO
11100000 00A5 A1 A0 D15yyyyD0 D15yyyyD0
Input of continuous address data into Hands-free parameter RAM
S_RESET
RQ
SCLK
SI
RDY
SO
11100000 00A5 A1 A0 D15yyyyD0
11100000 00A5 A1 A0 D15yyyyD0
Input of discontinuous address data into Hands-free parameter RAM
[MS0296-E-00]
55
2005/03