參數(shù)資料
型號: HT9580
廠商: Holtek Semiconductor Inc.
英文描述: Character Pager Controller
中文描述: 字符傳呼機控制器
文件頁數(shù): 21/63頁
文件大?。?/td> 444K
代理商: HT9580
HT9580
21
April 28, 2000
Preliminary
If the internal 2 Mbits mask ROM is placed as
shown in the figure and the software program-
mer obtains a start address from CNS (Taiwan)
code or a GB (China) code, A0~A17. The follow-
ing steps will map from the start address to the
bank point register, then the hardware address
decode circuit will point to the real 2 Mbits
space. (If the internal mask ROM is selected.)
Step 1
The formula obtains A0~A18 from the re-
ceived GB or CNS code. If it is in the lower 2
Mbits space, A18=0. Otherwise, A18=1 if it is
in reserved space.
Step 2
Set (BP_MODM1, BP_MODM0)=(0, 1)
Step 3
Assign correct M_BP0 ~ M_BP5 as shown:
A13
A14
A15
A16
A17
A18
tion)
Step 4
Adding $1000 H to A12~A0 to get new HEX
value $B
3
B
2
B
1
B
0
H.
M_BP0
M_BP1
M_BP2
M_BP3
M_BP4
M_BP5 (the bit will be 0 at this condi-
Step 5
The following example will load 32 bytes con-
tinuous (one Chinese word) pattern from the
internal mask ROM and store them to the
start address $C
3
C
2
C
1
C
0
H (if absolute index
addressing mode is used).
LDX
LDY
READ:
LDA
STA
INX
INY
CPX
BNZ
#00H
#00H
$B
3
B
2
B
1
B
0
, X
$C
3
C
2
C
1
C
0
, Y
#20H
READ
! 7
! " ; G G %
< 0
! " ; G G %
-
* -
+ -
-
)
.
"
(
,
+
*
)
*
. " , + * )
*
! H H
* H
) %
)
! H H . H " %
! H ( H , H + %
! * H ) H H
%
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