UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 569

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

mounted on the board.
26.1 Internal Memory Size Switching Register
The 78K0/KE2 incorporates the flash memory to which a program can be written, erased, and overwritten while
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 Be sure to set each product to the values shown in Table 26-1 after a reset release.
Caution To set the memory size, set IMS and then IXS. Set the memory size so that the internal ROM and
Address: FFF0H
Symbol
IMS
internal expansion RAM areas do not overlap.
RAM2
RAM2
ROM3
Figure 26-1. Format of Internal Memory Size Switching Register (IMS)
7
0
1
0
0
1
1
1
After reset: CFH
Other than above
ROM2
RAM1
RAM1
Other than above
6
0
1
1
1
0
1
1
CHAPTER 26 FLASH MEMORY
R/W
ROM1
RAM0
RAM0
User’s Manual U17260EJ6V0UD
5
0
0
0
1
0
0
1
768 bytes
1024 bytes
Setting prohibited
ROM0
4
0
0
0
0
0
1
Internal high-speed RAM capacity selection
16 KB
24 KB
32 KB
48 KB
60 KB
Setting prohibited
ROM3
3
Internal ROM capacity selection
ROM2
2
ROM1
1
ROM0
0
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