Freescale Semiconductor, Inc.
GENERAL RELEASE SPECIFICATION
11.2.4 Bit Manipulation Instructions
The CPU can set or clear any writable bit in the first 256 bytes of memory. Port
registers, port data direction registers, timer registers, and on-chip RAM locations
are in the first 256 bytes of memory. The CPU can also test and branch based on
the state of any bit in any of the first 256 memory locations. Bit manipulation
instructions use direct addressing. Table 11-4 lists these instructions.
Table 11-4. Bit Manipulation Instructions
Instruction
Mnemonic
BCLR
Clear Bit
Branch if Bit Clear
Branch if Bit Set
Set Bit
BRCLR
BRSET
BSET
11.2.5 Control Instructions
These register reference instructions control CPU operation during program
execution. Control instructions, listed in Table 11-5, use inherent addressing.
Table 11-5. Control Instructions
Instruction
Mnemonic
CLC
Clear Carry Bit
Clear Interrupt Mask
CLI
No Operation
NOP
RSP
RTI
Reset Stack Pointer
Return from Interrupt
Return from Subroutine
Set Carry Bit
RTS
SEC
SEI
Set Interrupt Mask
Stop Oscillator and Enable IRQ Pin
Software Interrupt
STOP
SWI
Transfer Accumulator to Index Register
Transfer Index Register to Accumulator
Stop CPU Clock and Enable Interrupts
TAX
TXA
WAIT
INSTRUCTION SET
Rev. 2.0
11-7
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