EM6521 Datasheet, PDF (51/68 Pages) List of Unclassifed Manufacturers – 4 bit Microcontroller

R
15 Peripheral Memory Map
Reset values are valid after power up or after every system reset.
Register
Name
Add Add Reset
Hex Dec. Value
Read Bits
Write Bits
b'3210
Read / Write Bits
Ram1_0
00 0
xxxx
0: Data0
1: Data1
2: Data2
3: Data3
...
Ram1_63
... ...
3F 63
...
xxxx
Ram2_0
40 64 xxxx
0: Data0
1: Data1
2: Data2
3: Data3
0: Data0
1: Data1
2: Data2
3: Data3
...
Ram2_3
... ...
43 67
...
xxxx
0: Data0
1: Data1
2: Data2
3: Data3
LCD_1
LCD_2
LCD_3
44 68
45 69
46 70
xxxx
xxxx
xxxx
Connections are user definable.
See LCD section
Connections are user definable.
See LCD section
Connections are user definable.
See LCD section
EM6521
Remarks
Normal addressable
Ram 64x4 bit
...
Normal addressable
Ram 64x4 bit
16 nibbles addressable over
index register
on add 'H70
16 nibbles addressable over
index register
on add 'H70
16 nibbles addressable over
index register on add 'H70
16 nibbles addressable over
index register on add 'H70
The 8 lower nibbles are
addressable over the index
register on add 'H70.
The 8 higher Nibbles are not
used and not implemented
---
47 71
...
... ...
---
4F 79
RegPA
RegPBCntl
50 80
51 81
xxxx
0000
0: PAData[0]
1: PAData[1]
----
2: PAData[2]
3: PAData[3]
0: PBIOCntl[0]
1: PBIOCntl[1]
2: PBIOCntl[2]
3: PBIOCntl[3]
Reserved, not implemented
...
Reserved, not implemented
Read port A directly
Port B control
Default: input mode
Copyright © 2005, EM Microelectronic-Marin SA
51
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