Echelon Neuron - Manual (Page 133)

SHR (Shift Right)
The SHR instruction shifts the byte in TOS one bit to the right. The SHR
instruction uses the implicit addressing mode. This instruction moves a zero into
bit 7 of TOS, and discards bit 0. This instruction also clears the Carry flag.
Figure 13 shows the operation of the SHR instruction.
TOS
7 0
0
C 0
Figure 13. The SHR Instruction
The SHR instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The SHR instruction requires no operands:
SHR
Table 54 describes the attributes of the SHR instruction.
Table 54. SHR Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
SHR 3A 1 2 Cleared
Example:
The following example pushes the number 150 (h’96) onto the data stack, and
then uses the SHR instruction to shift the TOS value right. After the SHR
instruction completes, TOS has the value 75 (h’4B) and the Carry flag is cleared.
push #d’150 ; ( d’150, -- )
shr ; ( d’75, -- )
Neuron Assembly Language Reference 123