Section 25 Audio Codec Interface (HAC)
Rev.1.00 Dec. 13, 2005 Page 976 of 1286
REJ09B0158-0100
25.5.5 Initialization
Sequence
Figure 25.3 shows an example of the initialization sequence.
No
No
Yes
Yes
(1) HACACR = H'0000 0000
(2) Set HACCSAR and HACCSDR
(3) HACACR = H'01E0 0000
Start
HAC cold reset (HACCR = H'0000 0A00)
Start DMA transfer (Receiver/Transmitter)
(HACCR = H'0000 0020)
Codec ready?
(HACCR = H'0000 8000)
Set DMAC
Set read address H'26(Power-down Ctrl/Stat)
(HACCSAR = H'000A 6000)
External codec internal status
ADC, DAC, Analog, REF = ready?
(HACCSDR = H'0000 00F0)
Set read volume and sampling rate
TX, RX enable
(set HACACR = H'03E0 0000: 20-bit DMATX,
slot 1 and slot 2 are atomic control)
External
codec
device
initialization
HAC
module
initialization
Note: Refer to section 14, Direct Memory Access Controller (DMAC).
Figure 25.3 Initialization Sequence
Содержание SH7780 Series
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