reg05b0008_h8slpap| Application Note
APPLICATION NOTE
H8/300L SLP Series
Fast MSB and LSB Rotate Method for 8 bit Data
Introduction
The serial communication interface present on some of the SLP devices is capable of both synchronous and asynchronous communication. When receiving byte information, it is sometimes necessary to rotate the received data from MSB first to LSB first and vice versa. This application note investigates methods of speeding up an LSB to MSB rotate.
Contents
CONTENTS .................................................................................................................................................. 1 AIM .............................................................................................................................................................. 2 1. 8 BIT ROTATE THEORY..................................................................................................... 2
TRADITIONAL 8 BIT ROTATE................................................................................................................... 2 LOOK UP TABLE ................................................................................................................................... 3 2. 3. WORKSPACE ................................................................................................................... 6 CODE DESCRIPTION ......................................................................................................... 6
SWAP_MSB_LSB FUNCTION ............................................................................................................... 8 LOOK_UP_TABLE_METHOD FUNCTION ................................................................................................. 9 4. PERFORMANCE RESULTS ............................................................................................... 10
SPEED ............................................................................................................................................... 10 CODE SIZE ......................................................................................................................................... 11 CONCLUSION............................................................................................................................................ 12
REG05B0008-0100/Rev.1.00
October 2008
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