Hitachi SH7750 Programming Manual page 401

TSTM(long i) /* TST.B #imm,@(R0,GBR) */
{
long temp;
temp=(long)Read_Byte(GBR+R[0]);
temp&=(0x000000FF & (long)i);
if (temp==0) T=1;
else T=0;
PC+=2;
}
Example
TST R0,R0
TST #H'80,R0
TST.B #H'A5,@(R0,GBR) ;Before execution (R0,GBR) = H'A5
;Before execution R0 = H'00000000
;After execution T = 1
;Before execution R0 = H'FFFFFF7F
;After execution T = 1
;After execution T = 0
Rev. 2.0, 03/99, page 387 of 396