SH7268/SH7269 Group

Transmission/Reception of Renesas SPDIF Interface

6.8.8

Interrupt Function of RSPDIF

Figure 6.10 shows the Interrupt Function of RSPDIF.

io_rspdif_isr

Read interrupt status and

identify valid bit

return

Obtain interrupt status information allowed by CTRL register from STAT register

Dummy read STAT register and

secure the time for flag clear

No

Other interrupt sources

Transmitter user info. empty

(TUIR=1)

Secure time for clearing interrupt

source flag

Receiver user info. full

(RUIR=1)

Transmitter channel

status empty (CSTX=1)

Receiver channel

status full

(CSRX=1)

Transmission error

valid or invalid?

Error occurred?

Valid (TEIE=1)

Invalid

(TEIE=0)

Clear TME bit and TDE bit of CTRL register

Restart SPDIF transmission

io_spdout_start

Stop operation and DMA transfer of

transmitter module

Clear error flag

Yes

Write channel status info. to

data register

Clear update notification (NCSI bit)

Read channel status info. from

data register

No

Receive error

valid or invalid?

Error occurred?

Valid (REIE=1)

Invalid (REIE=0)

Clear RME bit and RDE bit of CTRL register

Dummy read STAT register and wait until flag is cleared after

clearing RME bit and RDE bit of CTRL register

Restart SPDIF reception

io_spdin_start

Stop operation and DMA transfer of

receiver module

Clear error flag

Yes

Dummy read STAT register and wait until flag is cleared after

clearing TME bit and TDE bit of CTRL register

Yes

(register full)

Empty flag negated?

Write user info. (4-byte) to

data register

Wait for maximum one frame

Read user info. (4-byte) from

data register

No (flag kept empty)

Figure 6.10 Interrupt Function of RSPDIF

R01AN1188EJ0100 Rev.1.00

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Jul. 27, 2012