[ASAHI KASEI]
[AK7740ET]
7-1-e) External conditional jump code write (during reset phase)
The data comprising a set of two bytes is used to perform an external conditional jump code write operation. Input the
data during either the reset or operation phase, and the input data are set to the specified register at the leading edge of
the LRCLK. When all data bits have been transferred, the RDY terminal goes to "L". Upon completion of writing, it
goes to "H". A jump command will be executed if there is any one agreement between "1" of each bit of external
condition code eight bits (soft set), plus one bit (hard set) at the external input terminal JX and "1" of each bit of the
IFCON field. The data during the reset phase can be written only before release of the reset, after all data has been
transferred. RQ Transition from "L" to "H" in the write operation during the reset phase must be executed after
three LRCLK in slave mode or one LRCLK in master mode, respectively, from the trailing edge of LRCLK after
release of the reset. Then RDY goes to "H" after capturing the rise of the next LRCLK. Write operations from the
microcontroller are disabled until RDY goes to "H". The IFCON field provides external conditions written on the
program. It resets to 00h by INIT_RESET =”L”, however, it remains previous condition even S_RESET =”L”.
Note: LRCLK phase is inverted in the I2S-compatible mode.
7
0 JX
External condition code
Ç
Check if there is any one agreement between the bit specified in IFCON and
"1" in the external condition code
16
IFCON field
È
8
Data transfer procedure
c Command code
d Code data
C4h ( 1 1 0 0 0 1 0 0)
(D7 . . . . . D0)
Max 1LRCLK
S_RESET
SCLK
SI
11000100 D7 **** D0
SO
RQ
L ch R ch
LRCLK
2LRCLK(max)
Timing for external conditional jump write operation (during reset phase)
RDY
<Pre-E-01>
- 34 -
2006/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
