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CHAPTER 26
µ
PD78P058F, 78P058FY
26.1 Memory Size Switching Register
In the
µ
PD78P058F and 78P058FY, internal memory can be selected through the memory size select register
(IMS). The same memory mapping as that of mask ROM versions that have a different internal memory can be done
by setting IMS.
IMS is set with an 8-bit memory manipulation instruction.
RESET input sets IMS to CFH.
Figure 26-1. Memory Size Switching Register Format
Note
When using the external device expansion function with
µ
PD78058F, 78P058F, 78058FY and 78P058FY,
the capacity of the internal ROM should be less than 56 Kbytes.
The IMS settings to give the same memory map as mask ROM versions are shown in Table 26-2.
Table 26-2. Examples of Memory Size Switching Register Settings
Relevant Mask ROM Version
IMS Setting
µ
PD78056F, 78056FY
CCH
µ
PD78058F, 78058FY
CFH
7
RAM2
Symbol
IMS
6
RAM1
5
RAM0
4
0
3
ROM3
2
ROM2
1
ROM1
0
ROM0
Address
FFF0H
CFH
After
Reset
R/W
R/W
Internal ROM Capacity Selection
ROM3 ROM2 ROM1 ROM0
Setting prohibited
Other than above
Internal High-Speed RAM Capacity Selection
RAM2 RAM1 RAM0
1024 bytes
1
1
0
Setting prohibited
Other than above
1
56 Kbytes
1
1
0
1
48 Kbytes
1
0
0
1
60 Kbytes
1
1
1
Note
Summary of Contents for PD78056F
Page 2: ...2 MEMO ...
Page 14: ...14 MEMO ...
Page 34: ...34 MEMO ...
Page 154: ...154 MEMO ...
Page 170: ...170 MEMO ...
Page 238: ...238 MEMO ...
Page 278: ...278 MEMO ...
Page 432: ...432 MEMO ...
Page 476: ...476 MEMO ...
Page 548: ...548 MEMO ...
Page 564: ...564 MEMO ...
Page 580: ...580 MEMO ...
Page 584: ...584 MEMO ...
Page 592: ...592 MEMO ...