Analog Devices adsp-2100 Manual page 352

TEST BIT, SET BIT, CLEAR BIT, TOGGLE BIT
Syntax:
[ IF cond ]
Permissible xops
AX0 MR2
AX1 MR1
AR MR0
SR1
SR0
Permissible n values (0=LSB)
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
Examples:
AF=TSTBIT 5 OF AR;
AR=TGLBIT 13 OF AX0;
Description:
Test the optional condition and if true, then perform the
specified bit operation. If the condition is not true then perform a no-
operation. Omitting the condition performs the operation unconditionally.
These operations cannot be used in multifunction instructions.
These operations are defined as follows:
TSTBIT is an AND operation with a 1 in the selected bit
SETBIT is an OR operation with a 1 in the selected bit
CLRBIT is an AND operation with a 0 in the selected bit
TGLBIT is an XOR operation with a 1 in the selected bit
The ASTAT status bits are affected by these instructions. The following
instructions could be used, for example, to test a bit and branch accordingly:
AF=TSTBIT 5 OF AR;
IF NE JUMP set;
set*/
Status Generated:
ASTAT: 7 6
SS MV AQ AS
– –
(ADSP-217x, ADSP-218x, ADSP-21msp58/59 only)
AR = TSTBIT n OF xop
AF SETBIT n OF xop
CLRBIT n OF xop
TGLBIT n OF xop
Permissible conds (see Table 15.9)
EQ LE AC
NE NEG NOT AC
GT POS MV
GE AV NOT MV
LT NOT AV NOT CE
/*Jump to "set" if bit 5 of AR is
5 4 3 2
AC AV AN AZ
– – 0 0
(instruction continues on next page)
;
1 0
* *
ALU
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