Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 138)

120

3.2 Functions

Chapter 3 Functions

String MOVe Backward

Transfer string backward

[ Syntax ]

SMOVB.size

[ Description Example ]

SMOVB.B

[ Related Instructions ] SMOVF,SSTR

SMOVB SMOVB

B , W

[ Operation ]

Flag

Change

UIOBSZDC

232

[ Instruction Code/Number of Cycles ]

Page=

[ Flag Change ]

[ Function ]

• This instruction transfers string in successively address decrementing direction from the source ad-

dress indicated by 20 bits to the destination address indicated by 16 bits.

• Set the 4 high-order bits of the source address in R1H, the 16 low-order bits of the source address in

A0, the destination address in A1, and the transfer count in R3.

• The A0 or A1 when the instruction is completed contains the next address of the last-read data.

• If an interrupt request is received during instruction execution, the interrupt is acknowledged after one

data transfer is completed.

*1 If you set a value 0 in R3, this instruction is ingored.

*2 If A0 underflows, the content of R1H is decremented by 1.

When size specifier (.size) is (.B)

Repeat

M(A1) M(2

R1H + A0)

A0 – 1

A1 A1 – 1

R3 R3 – 1

Until R3 = 0

When size specifier (.size) is (.W)

Repeat

M(A1) M(2

R1H + A0)

A0 – 2

A1 A1 – 2

R3 R3 – 1

Until R3 = 0

1 2 ... 133 134 135 136 137 138 139 140 141 142 143 ... 307 308

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