Renesas SH7727 General Information Manual page 98

R0P7727TH003TRKE General Information Manual
[For infrared signal transmission]
(1) When transmission data is transmitted, it is written to the transmitting FIFO data register. The data count
for one frame of transmission data and the data itself are written to this data register. In addition, this
transmission data count is not counted as transmission data.
(2) The count for data not transmitted is set in the transmission data count register (IRRSDNR).
(3) Data can be written to the transmission data IRRSFDR until the count for data not transmitted (IRRSDNR)
reaches 255.
(4) When a frame of data has been transmitted (TDI=1), the IRRIF bit of the RTKISR register is set to "1." An
interrupt for transmission completion occurs so long as it is enabled.
To change the type of format, the FORMAT value of the same register must be set before the
START bit of the IRRCR register is set to "1."
When the START bit of the IRRCR register is "0," transmission/reception is not
guaranteed.
When the specified size is larger than the IRRRDNR value during a read operation, "FF" is set for
excessive read data.
Only the custom code and data code are specified for transmission data, and the leader, stop bit,
frame space, and trailer are automatically added.
When the number of write data items is larger than that of the remaining transmission data (255–
byte transmission data count register IRRSDNR), a data length error occurs.
When the IRRRFDR register has become full during a read operation, the buffer full error bit is set
to "1," and the data received later is discarded.
The IRRIF bit of the RTKISR register is cleared when "0" is written with the IRRIF bit set to "1."
CAUTION
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Power Supply Controller