GE 90-30/20/Micro manual Nxtcyc

4

Example 1:

In the following example, the shift register operates on register memory locations %R0001 through %R0100. When the reset reference CLEAR is active, the shift register words are set to zero.

When the NXT_CYC reference is active and CLEAR is not active, the word from output status table location %Q0033 is shifted into the shift register at %R0001. The word shifted out of the shift register from %R0100 is stored in output %M0005.

	_____
NXT_CYC
—— ———SHFR_—
	WORD
CLEAR
—— ———R		Q—%M0005
	LEN
	00100
%Q0033—IN
%R0001—ST
	_____

Example 2:

In this example, the shift register operates on memory locations %M0001 through %M0100. When the reset reference CLEAR is active, the SHFR function fills %M0001 through %M0100 with zeros.

When NXT_CYC is active and CLEAR is not, the SHFR function shifts the data in %M0001 to %M0100 down by one bit. The bit in %Q0033 is shifted into %M0001 while the bit shifted out of %M0100 is written to %M0200.

	_____
NXT_CYC
—— ———SHFR_—
	BIT
CLEAR
—— ———R		Q—%M0200
	LEN
	00100
%Q0033—IN
%M0001—ST
	_____

GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-79