參數(shù)資料
型號(hào)： μPD78P048A
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)： 20/72頁
文件大?。?/td> 387K
代理商： ΜPD78P048A
m
PD78P048A
20
0
0
0
0
IXRAM3 IXRAM2 IXRAM1 IXRAM0
IXS
7
6
5
4
3
2
1
0
Symbol
Address
On reset
R/W
FFF4H
0AH
W
IXRAM3 IXRAM2
1
1
0
1
Other than above
Selects internal expansion
RAM capacity
1024 bytes
No internal expansion RAM
Setting prohibited
IXRAM1
1
0
IXRAM0
0
0
4. INTERNAL EXPANSION RAM SIZE SWITCHING REGISTER (IXS)
By using this register, the internal expansion RAM of the
m
PD78P048A can be mapped in the same manner as
a mask ROM model.
IXS is set by an 8-bit memory manipulation instruction.
The contents of this register are set to 0AH at RESET.
Figure 4-1. Format of Internal Expansion RAM Size Switching Register
Table 4-1 shows the value settings of IXS to map the internal expansion RAM of the
m
PD78P048A in the same
manner as the respective mask ROM models.
Table 4-1. Memory Size Switching Register Setting Values
Mask ROM Model
IXS Value Setting
m
PD78042F
0CH
m
PD78043F
m
PD78044F
m
PD78045F
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