r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1325

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

25.5.6
It is possible to stop or resume the supply of clock to the HAC using the MSTP16 and MSTP17
bits in the standby control register 0 (MSTPCR0), which is a register used in power-down modes.
To cancel module standby function and resume the supply of clock to the HAC, write 0 to the
MSTP16 and MSTP17 bits in the standby control register 0 (MSTPCR0). It enables all accesses to
the HAC.
To place the HAC into the power-down mode, take the following steps:
1. Check that all data transfers have ended. Also check that the transmit buffer is empty and the
2. Disable all DMA requests and interrupt requests.
3. Place the codec into power-down mode.
4. Write 0 to the MSTP16 and MSTP17 bits in the standby control register 0 (MSTPCR0).
25.5.7
The HAC_SYNC signal is generated by the HAC to indicate the position of slot 0 within a frame.
When using the two channels of the HAC concurrently, connect the HAC_RES pin to the reset
pins of the two codecs.
25.5.8
AC'97 Component Specification, Revision 2.1
receive buffer has been read out to be empty.
Power-Down Mode
Notes
Reference
Rev.1.00 Jan. 10, 2008 Page 1295 of 1658
25. Audio Codec Interface (HAC)
REJ09B0261-0100