Bmtstc, Bit-masked test a, Bit operand if clear (bmu) description – Freescale Semiconductor StarCore SC140 User Manual
Page 403: Operation assembler syntax
BMTSTC
SC140 DSP Core Reference Manual
A-89
BMTSTC
Bit-Masked Test a
BMTSTC
16-Bit Operand If Clear (BMU)
Description
These operations use an unsigned 16-bit immediate data mask to determine if all selected bits in an
operand are cleared. If all the selected bits are cleared, the T bit is set; if not, the T bit is cleared.
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
Example
bmtstc #$8a59,d7.h
Operation
Assembler Syntax
if (#u16 & C1.H) == $0000, then 1
→ T, else 0 → T
BMTSTC #u16,C1.H {0
≤ u16 < 2
16
}
if (#u16 & C1.L) == $0000, then 1
→ T, else 0 → T
BMTSTC #u16,C1.L {0
≤ u16 < 2
16
}
if (#u16 & DR.H) == $0000, then 1
→ T, else 0 → T
BMTSTC #u16,DR.H {0
≤ u16 < 2
16
}
if (#u16 & DR.L) == $0000, then 1
→ T, else 0 → T
BMTSTC #u16,DR.L {0
≤ u16 < 2
16
}
BMTSTC #u16,C1.H
Tests selected bits in the HP contents of a control register (C1).
BMTSTC #u16,C1.L
Tests selected bits in the LP contents of a control register (C1).
BMTSTC #u16,DR.H
Tests selected bits in the HP contents of a data or address register (DR).
BMTSTC #u16,DR.L
Tests selected bits in the LP contents of a data or address register (DR).
Register Address
Bit Name
Description
SR[18]
EXP
Determines working mode, and which SR or EMR is used for
instructions that have these registers as an operand.
Register Address
Bit Name
Description
SR[1]
T
Set if all the bits selected by the mask are clear, cleared otherwise.
Register/Memory Address
Before
After
immediate
$8A590000