Stm1 (Store Multiple Registers) - Fujitsu FR Family Instruction Manual

CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS

7.132 STM1 (Store Multiple Registers)

The "STM1" instruction accepts registers in the range R8 to R15 as members of the
parameter "reglist" (See Table 7.132-1.).
Registers are processed in descending numerical order.
If "R15" is specified in the parameter "reglist", the contents of "R15" retained before the
instruction is executed will be written to memory.
■ STM1 (Store Multiple Registers)
Assembler format: STM1 (reglist)
Operation: The following operations are repeated according to the number of registers specified in the
parameter "reglist".
R15 – 4 → R15
Ri → (R15)
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: If "n" is the number of registers specified in the parameter "reglist", the execution cycles
required are as follows.
a × n + 1 cycles
Instruction format:
Table 7.132-1 Bit Values and Register Numbers for "reglist" (STM1)
252
N Z V C
– – – –
MSB
1 0 0 0
Bit Register Bit
7 R8
6 R9
5 R10
4 R11
1 1 1 1
Register
3 R12
2 R13
1 R14
0 R15
LSB
reglist