206
CHAPTER 15
µ
PD78P083
Caution
If using mask ROM versions, do not specify any values in the IMS other than when resetting.
The IMS settings to give the same memory map as mask ROM versions are shown in Table 15-2.
Table 15-2. Examples of Memory Size Switching Register Settings
Relevant Mask ROM Version
IMS Setting
µ
PD78081
82H
µ
PD78082
64H
15.1 Memory Size Switching Register
It is possible to specify the internal memory of the
µ
PD78P083 by means of the memory size switching register
(IMS). By setting the IMS, memory mapping can be made to match the memory mapping of the
µ
PD78081 and 78082,
which have different internal memory.
IMS is set with an 8-bit memory manipulation instruction.
RESET input sets IMS to 46H.
Figure 15-1. Memory Size Switching Register Format
7
RAM2
Symbol
IMS
6
RAM1
5
RAM0
4
0
3
ROM3
2
ROM2
1
ROM1
0
ROM0
Address
FFF0H
46H
After
Reset
R/W
R/W
0
Internal ROM Capacity Selection
24 Kbytes
ROM3
1
ROM2
1
ROM1
0
ROM0
Setting prohibited
Other than above
Internal High-Speed RAM Capacity Selection
RAM2 RAM1 RAM0
512 bytes
0
1
0
0
0
8 Kbytes
16 Kbytes
0
1
1
0
0
0
384 bytes
0
1
1
Setting prohibited
Other than above
256 bytes
1
0
0
Содержание NEC PD78081(A)
Страница 23: ...xii MEMO...
Страница 37: ...14 CHAPTER 1 OUTLINE MEMO...
Страница 47: ...24 CHAPTER 2 PIN FUNCTION MEMO...
Страница 91: ...68 CHAPTER 4 PORT FUNCTIONS MEMO...
Страница 125: ...102 CHAPTER 6 8 BIT TIMER EVENT COUNTERS 5 AND 6 MEMO...
Страница 157: ...134 CHAPTER 10 A D CONVERTER MEMO...
Страница 193: ...170 CHAPTER 11 SERIAL INTERFACE CHANNEL 2 MEMO...
Страница 253: ...230 CHAPTER 16 INSTRUCTION SET MEMO...
Страница 269: ...246 APPENDIX B EMBEDDED SOFTWARE MEMO...