S3C8248/C8245/P8245/C8247/C8249/P8249
INSTRUCTION SET
6-85
TM
—
Test Under Mask
TM
dst,src
Operation:
dst AND src
This instruction tests selected bits in the destination operand for a logic zero value. The bits to be
tested are specified by setting a "1" bit in the corresponding position of the source operand
(mask), which is ANDed with the destination operand. The zero (Z) flag can then be checked to
determine the result. The destination and source operands are unaffected.
Flags:
C:
Unaffected.
Z:
Set if the result is "0"; cleared otherwise.
S:
Set if the result bit 7 is set; cleared otherwise.
V:
Always reset to "0".
D:
Unaffected.
H:
Unaffected.
Format:
Bytes
Cycles
Opcode
(Hex)
Addr Mode
dst src
opc
dst | src
2
4
72
r
r
6
73
r
lr
opc
src
dst
3
6
74
R
R
6
75
R
IR
opc
dst
src
3
6
76
R
IM
Examples:
Given: R0 = 0C7H, R1 = 02H, R2 = 18H, register 00H = 2BH, register 01H = 02H, and
register 02H = 23H:
TM
R0,R1
→
R0 = 0C7H, R1 = 02H, Z = "0"
TM
R0,@R1
→
R0 = 0C7H, R1 = 02H, register 02H = 23H, Z = "0"
TM
00H,01H
→
Register 00H = 2BH, register 01H = 02H, Z = "0"
TM
00H,@01H
→
Register 00H = 2BH, register 01H = 02H,
register 02H = 23H, Z = "0"
TM
00H,#54H
→
Register 00H = 2BH, Z = "1"
In the first example, if working register R0 contains the value 0C7H (11000111B) and register R1
the value 02H (00000010B), the statement "TM R0,R1" tests bit one in the destination register
for a "0" value. Because the mask value does not match the test bit, the Z flag is cleared to logic
zero and can be tested to determine the result of the TM operation.
Summary of Contents for S3C8248
Page 31: ...ADDRESS SPACES S3C8248 C8245 P8245 C8247 C8249 P8249 2 20 NOTES ...
Page 107: ...INTERRUPT STRUCTURE S3C8248 C8245 P8245 C8247 C8249 P8249 5 18 NOTES ...
Page 195: ...INSTRUCTION SET S3C8248 C8245 P8245 C8247 C8249 P8249 6 88 NOTES ...
Page 221: ...I O PORTS S3C8248 C8245 P8245 C8247 C8249 P8249 9 16 NOTES ...
Page 245: ...16 BIT TIMER 0 1 S3C8248 C8245 P8245 C8247 C8249 P8249 12 10 NOTES ...
Page 249: ...WATCH TIMER S3C8248 C8245 P8245 C8247 C8249 P8249 13 4 NOTES ...
Page 267: ...A D CONVERTER S3C8248 C8245 P8245 C8247 C8249 P8249 15 6 NOTES ...
Page 299: ...S3P8245 P8249 OTP S3C8248 C8245 P8245 C8247 C8249 P8249 21 8 NOTES ...
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