1989_MELPS_7700_Software_Manual

Instructions
4.1.3 Bit Manipulation Instructions
The bit manipulation instructions set the specified bits of the processor status register or
memory to "1" or "0".
The following table summarizes the bit manipulation instructions supported:
Category Instruction Description
Bit manipulation ClB Clears the specified memory bit to "0".
SEB
ClP
SEP
Sets the specified memory bit to "I".
Clears the specified bit of the processor status register's lower
byte (PSL) to "0".
Sets the specified bit of the processor status register's lower
byte (PSL) to "I".
4.1.4 Flag Manipulation Instructions
The flag manipulation instructions set to "1" or clear to "0" the C, I, m and V flags.
The following table summarizes the flag manipulation instructions supported:
Category Instruction Description
Flag setting ClC Clears the contents of carry flag to "0".
SEC Sets the contents of carry flag to "1 ".
ClM Clears the contents of data length selection flag to "0".
SEM Sets the contents of data length selection flag to "1 ".
CLI Clears the contents of interrupt disable flag to "0".
SEI Sets the contents of interrupt disable flag to "1 ".
ClV Clears the contents of overflow flag to "0".
4.1.5 Branching and Return Instructions
The branching and return instructions enable changing the program execution sequence.
The following table summarizes the branching and return instructions:
I
Category Instruction Description
Jump JMP Sets a new address in the program counter and jumps to the new
address.
BRA
JSR
Jumps to the address obtained by adding an offset value to the
contents of the program counter.
Saves the contents of the program counter to the stack and then
jumps to the new address.
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