UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 600

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

mounted on the board.
24.1 Internal Memory Size Switching Register
600
The internal memory capacity can be selected using the internal memory size switching register (IMS).
IMS is set by an 8-bit memory manipulation instruction.
Reset signal generation sets IMS to CFH.
Caution To set the memory size, set IMS and then IXS. Set the memory size so that the internal ROM and
The 78K0/FE2 incorporates the flash memory to which a program can be written, erased, and overwritten while
Note The
Caution Be sure to set each product to the values shown in Table 24-1 after a reset release.
Address: FFF0H
Symbol
IMS
the set values of the IMS of these devices is the same as those for the 48 KB product because banks are
used. For how to set the banks, see CHAPTER 4 MEMORY BANK SELECT FUNCTION (
78F0890 ONLY).
internal expansion RAM areas do not overlap.
μ
μ
μ
μ
μ
PD78F0887
PD78F0888
PD78F0889
PD78F0890
PD78F0889 and
ROM3
RAM2
RAM2
Figure 24-1. Format of Internal Memory Size Switching Register (IMS)
7
1
1
1
After reset: CFH
Flash Memory Versions (78K0/FE2)
Table 24-1. Internal Memory Size Switching Register Settings
Other than above
ROM2
RAM1
RAM1
Other than above
6
1
1
1
μ
PD78F0890 have internal ROMs of 96 KB and 128 KB, respectively. However,
CHAPTER 24 FLASH MEMORY
R/W
ROM1
RAM0
RAM0
User’s Manual U17554EJ4V0UD
5
0
0
1
1024 bytes
Setting prohibited
ROM0
4
0
0
1
Internal high-speed RAM capacity selection
48 KB
60 KB
Setting prohibited
ROM3
CCH
CFH
CCH
CCH
3
Note
Note
Internal ROM capacity selection
ROM2
IMS Setting
2
ROM1
1
μ
ROM0
PD78F0889,
0