1989_MELPS_7700_Software_Manual

Direct Indirect Long Indexed V.
Mode
Direct indirect long indexed Y addressing mode
Function The value obtained by adding the instruction's second byte and the contents of the
direct page register specifies 3 adjacent bytes in memory bank-Q, and the value
obtained by adding the contents of these bytes and the contents of the index register
Y specifies the address of the memory location where the actual data is stored. If,
however, the value obtained by adding the contents of the instruction's second byte
and the direct page register exceeds the bank-O range, the specified location will be
in bank-1. The 3 adjacent bytes memory location may be spread over two different
banks.
Instruction: ADC, AND, CMP, DIV, EOR, LDA, MPY, ORA, SBC, STA
ex.
: Mnemonic
ADCL A,(1EH), Y
(m=1, x=1)
Machine Code
n ,6 1E'6
.----~ 1252,.
1253,.
1254,.
Memory
DATA I (EF,.)
DATA II (01,.)
DATA ill (12,.)
Bank-O
Index
} Register Y
+[~ =120210,.
1-------
Dorect Page
Register
~+
-------
Op Code(77,.)
Operand(1E,.)
------..:.
r- ------
A-A+C+EJ4- DATA 120210,. _---...J
25