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UPD78P048A 데이터시트(PDF) 21 Page - Renesas Technology Corp

부품명 UPD78P048A
상세설명  MOS INTEGRATED CIRCUIT
PDF  73 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
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UPD78P048A 데이터시트(HTML) 21 Page - Renesas Technology Corp

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µPD78P048A
19
Data Sheet U10611EJ2V1DS
3. MEMORY SIZE SWITCHING REGISTER (IMS)
This is a register to disable use of part of internal memories by software. By setting this memory size switching
register (IMS), it is possible to get the same memory mapping as that of mask ROM product having different internal
memories.
The IMS is set up by the 8-bit memory manipulation instruction.
CFH will result by the RESET input.
Figure 3-1. Memory Size Switching Register Format
Symbol
IMS
Address
R/W
FFF0H
CFH
On Reset
R/W
RAM2
RAM1
RAM0
0
ROM3 ROM2 ROM1 ROM0
765432
10
Selection of Internal
ROM3 ROM2 ROM1 ROM0
ROM Capacity
0100
16K bytes
0110
24K bytes
1000
32K bytes
1010
40K bytes
1111
60K bytes
Other than above
Setting prohibited
Selection of Internal
RAM2
RAM1
RAM0
High-Speed RAM Capacity
010
512 bytes
110
1024 bytes
Other than above
Setting prohibited
Table 3-1 shows the setting values of IMS which makes the memory mapping the same as that of the various mask
ROM model.
Table 3-1. Memory Size Switching Register Setting Values
Target Mask ROM Product
IMS Setting Value
µPD78042F
44H
µPD78043F
46H
µPD78044F
C8H
µPD78045F
CAH



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