UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 601

• 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

24.2 Internal Expansion RAM Size Switching Register
(IXS).
The internal expansion RAM capacity can be selected using the internal expansion RAM size switching register
IXS is set by an 8-bit memory manipulation instruction.
Reset signal generation sets IXS to 0CH.
Caution To set memory size, set IMS and then IXS. Set memory size so that the internal ROM area and
Address: FFF4H
Symbol
IXS
Caution Be sure to set each product to the values shown in Table 24-2 after a reset release.
internal expansion RAM area do not overlap.
μ
μ
μ
μ
PD78F0887
PD78F0888
PD78F0889
PD78F0890
Figure 24-2. Format of Internal Expansion RAM Size Switching Register (IXS)
IXRAM4
Table 24-2. Internal Expansion RAM Size Switching Register Settings
7
0
0
0
0
After reset: 0CH
Flash Memory Versions (78K0/FE2)
IXRAM3
6
0
1
0
0
Other than above
R/W
CHAPTER 24 FLASH MEMORY
IXRAM2
User’s Manual U17554EJ4V0UD
5
0
0
1
0
IXRAM4
IXRAM1
4
0
0
0
IXRAM0
IXRAM3
08H
04H
00H
3
0
0
0
Internal expansion RAM capacity selection
2048 bytes
4096 bytes
6144 bytes
Setting prohibited
IXRAM2
IXS Setting
2
IXRAM1
1
IXRAM0
0
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