參數(shù)資料
型號(hào)： μPD78F4046
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(yè)數(shù)： 16/26頁(yè)
文件大小： 159K
代理商： ΜPD78F4046
m
PD78F4046
1 6
6. INTERNAL MEMORY SIZE SWITCHING REGISTER (IMS)
This register prohibits part of the internal memory from being used by software. By using this register, the
internal memory capacity (ROM and RAM) of the
m
PD78F4046 can be changed to the same memory mapping
as a mask ROM model.
This register is set by using an 8-bit memory manipulation instruction.
Its contents are set to DEH at RESET.
Figure 6-1. Format of Internal Memory Size Switching Register (IMS)
Table 6-1 shows the values to set to the IMS to change the memory mapping of the
m
PD78F4046 to the same
capacity as a mask ROM model.
Table 6-1. Set Value of Internal Memory Size Switching Register (IMS)
Mask ROM Model
Set Value of IMS
m
PD784044, 784054
CDH
Note
m
PD784046
DEH
Note
The peripheral RAM capacity of the
m
PD78F4046 is 768 bytes when the IMS is set to CDH. The peripheral
RAM capacity of the
m
PD784044 and 784045 is 512 bytes. When using as a mask ROM, therefore, do
not use the addresses 0FA00H through 0FAFFH (when the LOCATION 0 instruction is executed) of the
peripheral RAM area of the
m
PD78F4046.
7
1
6
1
5
ROM1
4
ROM0
3
1
2
1
1
RAM1
0
RAM0
IMS
ROM1
0
0
ROM0
0
1
Others
32 K bytes
64 K bytes
Setting prohibited
Selects internal ROM capacity
Address : 0FFFCH At reset : DEH R/W
RAM1
0
1
RAM0
1
0
Others
768 bytes
1.5 K bytes
Setting prohibited
Selects peripheral RAM capacity
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