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Renesas rl78 User Manual

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RL78/G1A 
CHAPTER  14   MULTIPLIER  AND  DIVIDER/MULTIPLY-ACCUMULATOR 
Notes 1.  Bits 1 and 2 are read-only bits. 
 
2.  The DIVST bit can only be set (1) in the division mode.  In the division mode, division operation is started 
by setting (1) the DIVST bit.  The DIVST bit is automatically cleared (0) when the operation ends.  In the 
multiplication mode, operation is automatically started by setting the multiplier and multiplicand to 
multiplication/division data register A (MDAH, MDAL), respectively. 
 
Cautions  1.  Do not rewrite the DIVMODE, MDSM bits during operation processing (while the DIVST bit is 1).  If 
it is rewritten, the operation result will be an undefined value. 
 
2.  The DIVST bit cannot be cleared (0) by using software during division operation processing 
(while the DIVST bit is 1). 
 
R01UH0305EJ0200  Rev.2.00 
 
 
659  
Jul 04, 2013