Renesas R8C series User Manual

R8C/1A Group, R8C/1B Group 20. Usage Notes
Rev.1.30 Dec 08, 2006 Page 302 of 315
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20.4 Notes on Serial Interface
• When reading data from the U0RB register either in the clock asynchronous serial I/O mode or in the clock
synchronous serial I/O mode. Ensure the data is read in 16-bit units. When the high-order byte of the U0RB
register is read, bits PER and FER in the U0RB register and the RI bit in the U0C1 register are set to 0.
To check receive errors, read the UiRB register and then use the read data.
Example (when reading receive buffer register):
MOV.W 00A6H,R0 ; Read the U0RB register
• When writing data to the U0TB register in the clock asynchronous serial I/O mode with 9-bit transfer data
length, write data to the high-order byte first then the low-order byte, in 8-bit units.
Example (when reading transmit buffer register):
MOV.B #XXH,00A3H ; Write the high-order byte of U0TB register
MOV.B #XXH,00A2H ; Write the low-order byte of U0TB register

Renesas R8C series Specifications

General

Brand	Renesas
Model	R8C series
Category	Computer Hardware
Language	English