5.9. Test Variable Bit in Register

Addr
Mode  Mnemonic          Format/Opcode
                           8      4      4
                        ----------------------
R     TVBR  RA,RB       |  5E  |  RA  |  RB  |
                        ----------------------

Description. Bit number N (0 <= N <= 15) of register RB is tested where the least significant four bits of the contents of register RA is N. The Condition Status, CS, is then set to indicate non-zero if bit number N of register RB is a one. Otherwise, CS is set to indicate zero.

Register Transfer Description.

N = (RA)_12-15;
(CS) <-- 0010  if (RB_N ) = 0 and 0 <= N <= 15;
(CS) <-- 0001  if (RB_N) = 1 and N = 0;
(CS) <-- 0100  if (RB_N) = 1 and 1 <= N <= 15;

Registers Affected. CS