5.49. Store Register Through Mask

Addr
Mode  Mnemonic          Format/Opcode
                           8      4      4           16
D     SRM   RA,ADDR     --------------------------------------
DX    SRM   RA,ADDR,RX  |  97  |  RA  |  RX  |  |    ADDR    |
                        --------------------------------------

Description. The contents of register RA are stored into the Derived Address, DA, through the mask in register RA+1. For each position in the mask that is a one, the corresponding bit of register RA is stored into the corresponding bit of the DA. For each position in the mask that is a zero no change is made to the corresponding bit stored in the DA.

Register Transfer Description.

[DA] <-- {[DA] ^ ~(RA+1)} v {[RA] ^ [RA+1]};
(RA+1) = MASK, (RA) = DATA;
or, equivalently,
(RQ) <-- [DA];
(RQ)_i <-- (RA)_i if (RA+1) _i = 1 for i = 0, 1, ..., 15;
[DA] <-- (RQ);

Registers Affected. None