1989_MELPS_7700_Software_Manual

Absolute Bit
Mode
Function
Absolute bit addressing mode
The contents of the instruction's second and third bytes and the contents of the data
bank register specify the memory locations, and data for multiple bit positions in the
memory locations are specified by a bit pattern specified in the instruction's fourth and
fifth bytes (the fourth byte only if the m flag is set to 1).
Instruction: CLB, SEB
ex.
: Mnemonic
CLB :j:I:5AH, 1234H
(m=1)
Machine Code
1C 16 34 16 12 16 5A 16
ex. : Mnemonic
CLB :j:I:5AA5H, 1234H
(m=O)
Machine Code
1C 16 34 16 12 16 A5 16 5A 16
Memory
-
f---- --
Op Code (lC,.)
Operand (34,.)
Operand (12,.)
Operand (SA,.)
r-------
}
Memory
..-
----- -
Op Code (lC,.)
Operand (34,.)
Operand (12,.)
Operand (AS,.)
Operand (SA,.)
}
f-------
'1"'1"'1 ., 1 "? 1'1'1'
r--- ----
-
-
Data Bank
Register
~ 1234,.
Data Bank
Register
~ 1234,.
f------
r- ------
"1"1"1"1"1'1'1"
'?i" I ., I" I') 1 ''1'' I .,
-
r------
Data Bank
Register
~1234,.
Data Bank
Register
~1234,.
30