509
CHAPTER 22 EXTERNAL DEVICE EXPANSION FUNCTION
(2) Memory size switching register (IMS)
This register specifies the internal memory size. In principle, use IMS in a default status. However, when
using the external device expansion function with the
µ
PD78058F, 78P058F, 78058FY and 78P058FY, set
IMS so that the internal ROM capacity is 56 Kbytes or lower.
IMS is set with an 8-bit memory manipulation instruction.
RESET input sets this register to the value indicated in Table 22-3.
Figure 22-3. Memory Size Switching Register Format
Note
The values after reset depend on the product. (See Table 22-3)
Table 22-3. Values When the Memory Size Switching Register Is Reset
Part Number
Reset Value
µ
PD78056F, 78056FY
CCH
µ
PD78058F, 78058FY
CFH
1
1
48 Kbytes
56 Kbytes
1
1
0
1
0
0
7
RAM2
Symbol
IMS
6
RAM1
5
RAM0
4
0
3
ROM3
2
ROM2
1
ROM1
0
ROM0
Address
FFF0H
Note
After
Reset
R/W
R/W
Internal ROM Size Selection
ROM3
60 Kbytes
1
ROM2
1
ROM1
1
ROM0
1
Setting prohibited
Other than above
Internal High-Speed RAM Size Selection
RAM2 RAM1 RAM0
Setting prohibited
Other than above
1024 bytes
1
1
0
Содержание PD78056F
Страница 2: ...2 MEMO ...
Страница 14: ...14 MEMO ...
Страница 34: ...34 MEMO ...
Страница 154: ...154 MEMO ...
Страница 170: ...170 MEMO ...
Страница 238: ...238 MEMO ...
Страница 278: ...278 MEMO ...
Страница 432: ...432 MEMO ...
Страница 476: ...476 MEMO ...
Страница 548: ...548 MEMO ...
Страница 564: ...564 MEMO ...
Страница 580: ...580 MEMO ...
Страница 584: ...584 MEMO ...
Страница 592: ...592 MEMO ...