AK4636 Datasheet, PDF (67/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
■ Serial Control Interface
(1) 3-wire Serial Control Mode
Internal registers may be written and read by the 3-wire µP interface pins (CSN, CCLK and CDTIO). The data on this
interface consists of Read/Write, Register address (MSB first, 7bits) and Control data (MSB first, 8bits). Address and data
is clocked in on the rising edge of CCLK and data is clocked out on the falling edge. Data writing is valid on the rising
edge of the 16th CCLK after the falling edge of CSN. In reading operation, the CDTIO pin changes to output mode at the
falling edge of 8th CCLK and outputs D7-D0. The output finishes on the rising edge of CSN. However this reading
function is available only at READ bit = “1”. When READ bit = “0”, the CDTIO pin stays as Hi-Z even after the falling
edge of 8th CCLK. The CDTIO pin is placed in a Hi-Z state except outputting data at read operation mode. The clock
speed of CCLK is 5MHz (max). The value of internal registers is initialized at the PDN pin = “L”.
Note 42. A read operation is available at 00H ~ 11H, 1CH ~ 24H and 27H~30H addresses. When reading the address 12H
~ 1BH, 25H ~ 26H and 31H ~ 4FH, the register values are invalid.
CSN
CCLK
Clock, “H” or “L”
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Clock, “H” or “L”
CDTIO “H” or “L”
A6 A5 R/W A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 “H” or “L”
R/W: READ/WRITE (“1”: WRITE, “0”: READ)
A6-A0: Register Address
D7-D0: Control data
Figure 55. Serial Control I/F Timing
MS1012-E-01
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2010/08