AK7750 Datasheet, PDF (42/77 Pages) Asahi Kasei Microsystems – Audio DSP with Built-in Hands-Free Phone Features

[ASAHI KASEI]
[AK7750]
8) CONT7 : Hands-Free Status / Request
Command Code
Write Read
X DCh
Name
CONT7
D7
SRRQ
D6
D5
TEST TEST
D4
D3
D2
D1
D0 Default
TEST TEST TEST TEST
X
0000_000x
*) This register, together with HFST pin, is used to inform the host microcontroller that the hands-free
operation is enabled. HFST pin is usually at “H” but when an exception/interrupt occurs, this pin notifies
the host(this pin becomes “L”, and SRRQ goes to “1”).
Upon receipt of HFST = “L”, the host is expected to read and process the CONT7 register, depending on
the register content. This register is cleared by setting S_RESET pin to “L”, and HFST pin returns to “H”.
Reading should be made during S_RESET = “H” (during RUN ).
c D7:SRRQ
0: normal operation
1: requests that the host enable S-RESET.
This bit Indicates that a hardware-related error has occurred in hands-free mode.
If same error occurs again , initialize the AK7750 by issuing S_RESET = “L”.
d D6,D5,D4,D3,D2,D1,D0:TEST_MON
Monitor pin for test.
[MS0296-E-00]
42
2005/03