參數(shù)資料
型號(hào): μPD78P083A)
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 18/44頁
文件大小: 301K
代理商: ΜPD78P083A)
18
m
PD78P083(A)
3.
INTERNAL 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 the mask ROM versions with a different internal
memory (ROM, RAM).
IMS is set with an 8-bit memory manipulation instruction.
RESET input sets IMS to 46H.
Figure 3-1. Internal Memory Size Switching Register Format
RAM2
RAM1
RAM0
0
ROM3
ROM2
ROM1
ROM0
7
6
5
4
3
2
1
0
Symbol
IMS
Address
R/W
FFF0H
46H
After Reset
R/W
Selection of Internal
ROM Capacity
ROM3 ROM2 ROM1 ROM0
0
0
1
0
8 Kbytes
0
1
0
0
16 Kbytes
0
1
1
0
24 Kbytes
Other than above
Setting prohibited
Table 3-1 shows the setting values of IMS which make the memory mapping the same as that of the mask ROM
version.
Table 3-1. Internal Memory Size Switching Register Setting Values
Selection of Internal
High-Speed RAM Capacity
RAM2 RAM1 RAM0
0
1
0
512 bytes
0
1
1
384 bytes
1
0
0
256 bytes
Other than above
Setting prohibited
Target Mask ROM Versions
IMS Setting Value
μPD78081(A)
82H
μPD78082(A)
64H
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