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): 20/63頁
文件大小: 444K
代理商: HT9580
HT9580
20
April 28, 2000
Preliminary
The Mask ROM bank point register can switch
between the internal 2 Mbits Mask ROM or an
externalupto2MbitsMaskROMspace.These-
lectiontableisbasedonthefollowingtable.The
space size of each Mask ROM bank is 8 Kbytes.
The bits BP_MODM1 and BP_MODM0 define
whetherinternalorexternalMaskROMdevices
areused.(BP_MODM1,BP_MODM0)=(0,1),se-
lects the internal Mask ROM device.
(BP_MODM1, BP_MODM0)=(1, 0), selects the
external Mask ROM device. The internal Mask
ROMcanswitchfrombank0tobank31andthe
external Mask ROM can switch from bank 0 to
bnak 31 by software programming. In addition,
theaddressrangeoftheinternal/externalMask
ROMwillallrangefrom1000Hto2FFFH.
The Mask ROM bank point register selection
table is shown in the table.
&
'
:
&
9
5
$ $
&
33 4
$
I/O structure of port A
Mask ROM (Character ROM) bank point register
Address
Register
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
State on
POR
0015H
MROM-BP
BP_MODM1 BP_MODM0
M_BP5
M_BP4
M_BP3
M_BP2
M_BP1
M_BP0
0000 0000
BP_MODM1 BP_MODM0 M_BP5
M_BP4
M_BP3
M_BP2
M_BP1
M_BP0 BP Value
Memory Area
0
0
X
X
X
X
X
X
X
Reserved
0
1
0
0
0
0
0
0
0
Internal 2 Mbits Mask ROM (low 8 Kbytes)
0
1
0
1
0
1
1
1
1
1
31
Internal 2 Mbits Mask ROM (High 8
Kbytes)
0
1
1
0
0
0
0
0
32
Reserved
0
1
Reserved
0
1
1
1
1
1
1
1
63
Reserved
1
0
0
0
0
0
0
0
0
External2MbitsMaskROM(low8Kbytes)
1
0
1
0
0
1
1
1
1
1
31
External 2 Mbits Mask ROM (High 8
Kbytes)
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