Hitachi AP1 - Page 190

LCO-IV---------------------------------
• Dftignation of ROM Address and ROM Code
The bank part of the ROM address is shown in the binary
system and the page part in the decimal system. The address
part
is divided into 2 bits and 4 bits, and shown in the hexa-
decimal system.
It is possible to combine the bank part and the page part and
show the combined part
as the Page (in the decimal system).
(a) ROM Address
(Example
1)
;---IPage Part) ~
Bank Part
In this case, the 0 Page to the 31 Page in the Bank 1 are shown
as the 32 Page to the 63 Page. The examples are shown in Figure
3.
One word (10 bits) of ROM is divided into three parts (2
bits, 4 bits and 4 bits from the most significant bit
0
10
in order)
shown
in the hex a-decimal system. The examples are shown in
Figure 3.
"r- Page Part ---"'"'\\,-- Address Part ______
I I,: ° : ' : ° : ° I : ° : ° : ' : ' : ° I Bank' 20-26: Bank' 20 Page 26 Address
'--.J'---- Decimal ---I~ ~ Hexa. ----l 152-26: 52 Page 26 Address)
Binarv He~a- decimal
~---IDecimal) ___ --'I decimal
(Example 2)
r--1Page Part! \
Bank Part
r--\,- Page Part ~ r-- Addre .. Part ~
10 1°: 0: 0:' : ° 10: 0:': 0:': °
~ ~Declmal----1L---J\\..--_:_:_---....J
Blnlrv Hexa· Hexl'
I IDeclmal) I decimal dlclmal
(b) ROM Code
(Example
1)
Bank ° 2-0A: Bank ° 2 Page OA Address
12-0A:
2 Plge OA Address)
L.1_o~:,-- ...... _.....&._o ...... : _...1:'--...... :_0 ...... : _ ...... : _0_: ..... ,~1 ROM Pattern, Object Code: , B6
'- Hexa· J'-- Hexa-decimal-.J'--- Hexl-decimal--1
decimal
(Example 2)
L.1_o~:,--o ...... _.....&._o ...... : _...1:'--0 ...... :_0 ...... : _ ...... : _0_: ..... 0~1 ROM Pattern, Objlct Code: OA4
'- Hexa- J'--Hexa-clecimal -.J'-- Hexa-clecimal --1
decimal
Figure 3 Designation of ROM Address and ROM Code
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