Datasheet

V850ES/JG3 CHAPTER 3 CPU FUNCTION
R01UH0015EJ0300 Rev.3.00 Page 63 of 870
Sep 30, 2010
(3) Restriction on conflict between sld instruction and interrupt request
(a) Description
If a conflict occurs between the decode operation of an instruction in <2> immediately before the sld instruction
following an instruction in <1> and an interrupt request before the instruction in <1> is complete, the execution
result of the instruction in <1> may not be stored in a register.
Instruction <1>
• ld instruction: ld.b, ld.h, ld.w, ld.bu, ld.hu
• sld instruction: sld.b, sld.h, sld.w, sld.bu, sld.hu
• Multiplication instruction: mul, mulh, mulhi, mulu
Instruction <2>
mov reg1, reg2
satadd reg1, reg2
and reg1, reg2
add reg1, reg2
mulh reg1, reg2
not reg1, reg2
satadd imm5, reg2
tst reg1, reg2
add imm5, reg2
shr imm5, reg2
satsubr reg1, reg2
or reg1, reg2
subr reg1, reg2
cmp reg1, reg2
sar imm5, reg2
satsub reg1, reg2
xor reg1, reg2
sub reg1, reg2
cmp imm5, reg2
shl imm5, reg2
<Example>
<i> ld.w [r11], r10 If the decode operation of the mov instruction <ii> immediately before the sld
instruction <iii> and an interrupt request conflict before execution of the ld instruction
<i> is complete, the execution result of instruction <i> may not be stored in a register.
<ii> mov r10, r28
<iii> sld.w 0x28, r10
(b) Countermeasure
<1> When compiler (CA850) is used
Use CA850 Ver. 2.61 or later because generation of the corresponding instruction sequence can be
automatically suppressed.
<2> Countermeasure by assembler
When executing the sld instruction immediately after instruction <ii>, avoid the above operation using
either of the following methods.
• Insert a nop instruction immediately before the sld instruction.
• Do not use the same register as the sld instruction destination register in the above instruction <ii>
executed immediately before the sld instruction.
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