r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1318
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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25. Audio Codec Interface (HAC)
25.5
25.5.1
The HAC receiver receives serial audio data input on the HAC_SDIN pin, synchronous to
HAC_BITCLK. From slot 0, the receiver extracts tag bits that indicate which other slots contain
valid data. It will update the receive data only when receiving valid slot data indicated by the tag
bits.
Supporting data only in slots 1 to 4, the receiver ignores tag bits and data related to slots 5 to 12. It
loads valid slot data to the corresponding shift register to hold the data for PIO or DMA transfer,
and sets the corresponding status bits. It is possible to read 20-bit data within a 32-bit register
using PIO.
In the case of RX overrun, the new data will overwrite the current data in the RX buffer of the
HAC.
25.5.2
The HAC transmitter outputs serial audio data on the HAC_SDOUT pin, synchronous to
HAC_BIT_CLK. The transmitter sets the tag bits in slot 0 to indicate which slots in the current
frame contain valid data. It loads data slots to the current TX frame in response to the
corresponding slot request bits from the previous RX frame.
The transmitter supports data only in slots 1 to 4. The TX buffer holds data that has been
transferred using PIO or DMA, and sets the corresponding status bit. It is possible to write 20-bit
data within a 32-bit register using PIO.
In the case of a TX underrun, the HAC will transmit the current TX buffer data until the next data
arrives.
Rev.1.00 Jan. 10, 2008 Page 1288 of 1658
REJ09B0261-0100
Operation
Receiver
Transmitter
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