BU92747XXX Datasheet, PDF (35/46 Pages) Rohm – IrDA Controller LSI built-in Ir remote control

BD92747XXX
Datasheet
Opm=1
Irqe=1 Send=1
The period of transmitting data
Header
End
Irqe=0
Transmitting next data
IrRC
(or IrTX)
NIRQ
Internal interrupt
transmittion buffer
○^a
○^b
○^c ○^d ○^e
With forwarding value of output data register to the transmission buffer, it is enabled to update the output data register.
Therefore internal interrupt is generated (refer _○a in the figure).
・Regs bit sets “0”: if Send bit sets “1”, the value of output data register is forwarded to the transmission buffer and
internal interrupt is generated.
・Regs bit sets “1”: If Send bit sets “1”, the value of output data register is forwarded to the transmission buffer and
internal interrupt factor is generated. Afterward, the value of output data register is forwarded to the transmission
buffer when the last bit of transmission buffer is outputted. As often as this transmission is finished, internal
interrupt is generated.
Afterward, finished End part output, interrupt is generated (refer _○c in the figure).
When Irqc bit sets “1”, interrupt is cleared (refer _○b and _○d in the figure).
When Irqe bit sets “1”, internal interrupt is permitted. Therefore with generating the internal interrupt, NIRQ pin
outputs ”LOW” (refer _○a and _○c in the figure).
When Irqe bit sets “0”, NIRQ pin fixes “HIGH” (refer _○e in the figure).
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TSZ22111・15・001
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TSZ02201-0E4E0F100020-1-2
24. June. 2015 Rev.001