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CHAPTER 2 CPU
2.11 Precautions for Use of "DIV A, Ri" and "DIVW A, RWi"
Instructions
Set "00
H
" in the bank register before using the "DIV A, Ri" and "DIVW A, RWi"
instructions.
■ Precautions for Use of "DIV A, Ri" and "DIVW A, RWi" Instructions
If the value of the bank registers (DTB, ADB, USB, and SSB) is "00
H
", the remainder after division is
stored in the register of the instruction operands. Otherwise, the upper eight bits is specified by the bank
register corresponding to the register of the instruction operand, and the lower 16 bits is the same as the
address of the register of the instruction operand. The remainder is stored in the bank register specified by
the upper eight bits.
Table 2.11-1 Precautions for Use of "DIVA,Ri" and "DIVWA,RWi" Instructions (i=0 to 7)
Instruction
Bank register name affected
by the execution of the
instructions listed on the left
Address that stores the remainder
DIVA,R0
DTB
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+8
H
Lower 16 bits)
DIVA,R1
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+9
H
Lower 16 bits)
DIVA,R4
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+C
H
Lower 16 bits)
DIVA,R5
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+D
H
Lower 16 bits)
DIVWA,RW0
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+0
H
Lower 16 bits)
DIVWA,RW1
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+2
H
Lower 16 bits)
DIVWA,RW4
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+8
H
Lower 16 bits)
DIVWA,RW5
(DTB: Upper 8 bits)+(0180
H
+RP × 10
H
+A
H
Lower 16 bits)
DIVA,R2
ADB
(ADB: Upper 8 bits)+(0180
H
+RP × 10
H
+A
H
Lower 16 bits)
DIVA,R6
(ADB: Upper 8 bits)+(0180
H
+RP × 10
H
+E
H
Lower 16 bits)
DIVWA,RW2
(ADB: Upper 8 bits)+(0180
H
+RP × 10
H
+4
H
Lower 16 bits)
DIVWA,RW6
(ADB: Upper 8 bits)+(0180
H
+RP × 10
H
+E
H
Lower 16 bits)
DIVA,R3
USB, SSB
*1
(USB
*2
: Upper 8 bits)+(0180
H
+RP × 10
H
+B
H
Lower 16 bits)
DIVA,R7
(USB
*2
: Upper 8 bits)+(0180
H
+RP × 10
H
+F
H
Lower 16 bits)
DIVWA,RW3
(USB
*2
: Upper 8 bits)+(0180
H
+RP × 10
H
+6
H
Lower 16 bits)
DIVWA,RW7
(USB
*2
: Upper 8 bits)+(0180
H
+RP × 10
H
+E
H
Lower 16 bits)
*1: Depends on the S bit of the CCR register
*2: In the event that S bit of the CCR register is 0