PD178046_15 Datasheet, PDF (18/42 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD178046, 178048
2.1 Memory Size Select Register (IMS)
The internal memory capacities can be changed by using the memory size select register (IMS).
Set IMS to the value shown in Table 2-1 depending on the internal memory capacity of each model.
Use an 8-bit memory manipulation instruction to set this register.
IMS is set to CFH at reset.
Figure 2-2. Format of Memory Size Select Register (IMS)
Symbol 7
6
5
4
3
2
1
0
IMS RAM2 RAM1 RAM0 0 ROM3 ROM2 ROM1 ROM0
Address At reset R/W
FFF0H
CFH
R/W
RAM2 RAM1 RAM0
0
1
0 512 bytes
Others
Setting prohibited
Selects internal high-speed RAM capacity
RAM3 RAM2 RAM1 RAM0
1
1
0
0 48K bytes
1
1
1
1 60K bytes
Others
Setting prohibited
Selects internal ROM capacity
Table 2-1. Set Value of Memory Size Select Register (IMS)
Part Number
µPD178046
µPD178048
Set Value of IMS
4CH
4FH
16
Preliminary Product Information