HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 123
HD6417660
Manufacturer Part Number
HD6417660
Description
Renesas 32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417660.pdf
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The rule is shown in table 3.3.
Table 3.3
Note: The terms used above in table 3.3, are defined as follows.
Repeat Control Instructions and Repeat Control Macros: To describe a repeat loop, the RS
and RE registers must be specified appropriately by the LDRS and LDRE instructions and then the
number of repetitions must be specified by the SERTC instruction. An 8-bit immediate data or a
general register can be used as an operand of the SETRC instruction. To specify the RC as a value
greater than 256, use SETRC Rm type instructions.
Table 3.4
The RS and RE registers must be specified appropriately according to the rules shown in table 3.3.
The SH assembler supports control macros (REPEAT) as shown in table 3.5 to solve problems.
Register 1
RS
RE
Instruction
LDRS @(disp,PC)
LDRE @(disp,PC)
SETRC #imm
SETRC Rm
RptStart: Address of the repeat start instruction
RptStart0: Address of the instruction one instruction prior to the repeat start instruction
RptEnd3: Address of the instruction three instructions prior to the repeat end instruction
RptStart0 + 8
RptStart0 + 4
RS and RE Setting Rule
Repeat Control Instructions
Operation
Calculates (disp x 2 + PC) and stores the result to the RS
register
Calculates (disp x 2 + PC) and stores the result to the RE
register
Sets 8-bit immediate data imm to the RC[11:0] bits of the SR
register and sets the information related to the number of
repetitions to the RF[1:0] bits of the SR.
RC[11:0] can be specified as 0 to 255.
Sets the[11:0] bits of the Rm register to the RC[11:0] bits of
the SR register and sets the information related to the
number of repetitions to the RF[1:0] bits of the SR.
RC[11:0] can be specified as 0 to 4095.
2
RptStart0 + 6
RptStart0 + 4
Number of Instructions in Repeat Loop
3
RptStart0 + 4
RptStart0 + 4
Rev. 1.00, 02/04, page 85 of 804
≥4
RptStart
RptEnd3 + 4
Number of
Execution
States
1
1
1
1
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