RX610 Group
2. CPU
R01UH0032EJ0120 Rev.1.20
Page 76 of 1006
Feb 20, 2013
2.7
Operation of Instructions
2.7.1
Data Prefetching by the RMPA Instruction and the String-Manipulation
Instructions
The RMPA instruction and the string-manipulation instructions (SCMPU, SMOVB, SMOVF, SMOVU, SUNTIL,
SWHILE, and SSTR instructions are not included) may prefetch data from the memory to speed up the read processing.
Data is prefetched from the prefetching start position with three bytes as the upper limit. The prefetching start positions
of each operation are shown below.
•
RMPA instruction: The multiplicand address specified by R1, and the multiplier address specified by R2
•
SCMPU instruction: The source address specified by R1 for comparison, and the destination address specified by R2
for comparison
•
SUNTIL and SWHILE instructions: The destination address specified by R1 for comparison
•
SMOVB, SMOVF, and SMOVU instructions: The source address specified by R2 for transfer
Summary of Contents for RX600 Series
Page 1006: ...RX610 Group R01UH0032EJ0120 ...