1989_MELPS_7700_Software_Manual

Absolute Long
Mode
Function
Absolute long addressing mode
The contents of the memory locations specified by the instruction's second, third and
fourth bytes become the actual data. Note that, in the cases of the JMP and JSR
instructions, the instructions' second and third byte contents are transferred to the
program counter and the fourth byte contents are transferred to the program bank
register.
Instruction:
ADC,
SBC,
AND,
STA
CMP, DIV, EaR, JMP, JSR, LOA, MPY, ORA,
ex.
: Mnemonic Machine Code
ACe A, 123456H 6F 16 56 16 34 16 1216
(m=1)
Memory
-
--
~~----
ex. : Mnemonic Machine Code
ACe A, 123456H 6F 16 56 16 34 16 12 16
(m=O)
Memory
,-
r-------
Op Code (SF,.)
Operand (56,.)
Operand (34,.)
Operand (12,.)
I
Op Code (6F,.)
Operand (56,.)
Operand (34,.)
Operand (12,.)
}-
r-------
1------
1-------
-------
ex.
: Mnemonic
JMP 123456H
-
DATA
.....
........ -
Machine Code
123456 {
,. A~A+C+I DATAH: DATAL 1«-
5e16 56 16 34 16 12 16
DATAL
DATAH
, -
-
123456,.
Memory
-
-------
Op Code (5C,.)
Operand (56,.)
Operand (34,.)
Operand (12,.)
r-- ------
Address to be
executed next
f-------
-
Program
Bank Register
~3456,.
PlOgram bank register contents are replaced by
the third operand
35