1989_MELPS_7700_Software_Manual

D;,rect Indexed X Indirect
Mode
Function
. Direct indexed X indirect addressing mode
The value obtained by adding the instruction's second byte, the contents of the direct
page register and the contents of the index register X specifies 2 adjacent bytes in
memory bank-G, and the contents of these bytes in memory bank-G, and the contents
of these bytes in memory bank-DT (DT is contents of data bank register) become the
actual data. If, however, the value obtained by adding the instruction's second byte,
the direct page register's contents and the index register X's contents exceeds the
bank-G or bank-1 range, the specified location will be in bank-1 or bank-2.
Instruction: ADC, AND, CMP, DIV, EOR, LOA, MPY, ORA, SSG, STA
ex.
: Mnemonic
ADC A, (1EH, Xl
(m = 1, x = 1 l
Machine Code
61 16 1 E 16
Memory
DODO,.
{
DATAl (DO,.)
DATAII (14,.)
Bank-O
1338, • ...,..,----------,
-------
FFFF,.
f-------
Op Code (61,.)
Operand (lE,.)
1--------
Direct Page Index
Register Register X
+ I 1234,. 1+ I i E6,. 1=1338,.
Program
1 bank-PG
Data Bank
Register
A-A+C+I DATA 1- DATA ~1400,.
------
18