UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 628
![8BIT MCU, 128K FLASH, 7K RAM, LQFP](/photos/19/1/190186/ge64lqfp05-40_sml.jpg)
UPD78F0890GK(A)-GAJ-AX
Manufacturer Part Number
UPD78F0890GK(A)-GAJ-AX
Description
8BIT MCU, 128K FLASH, 7K RAM, LQFP
Manufacturer
NEC
Datasheet
1.UPD78F0890GKA-GAJ-AX.pdf
(732 pages)
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
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24.11 Boot Swap Function
in the boot area may be lost and the program may not be restarted by resetting.
boot cluster 1 in advance. When the program has been correctly written to boot cluster 1, swap this boot cluster 1 and
boot cluster 0 by using the set information function of the firmware of the 78K0/FE2, so that boot cluster 1 is used as a
boot area. After that, erase or write the original boot program area, boot cluster 0.
executed correctly because it is booted from boot cluster 1 to be swapped when the program is reset and started next.
information function of the firmware of the 78K0/FE2.
628
If rewriting the boot area has failed during self-programming due to a power failure or some other cause, the data
The boot swap function is used to avoid this problem.
Before erasing boot cluster 0
As a result, even if a power failure occurs while the boot programming area is being rewritten, the program is
If the program has been correctly written to boot cluster 0, restore the original boot area by using the set
Boot cluster 0 (0000H to 0FFFH): Original boot program area
Boot cluster 1 (1000H to 1FFFH): Area subject to boot swap function
Note A boot cluster is a 4 KB area and boot clusters 0 and 1 are swapped by the boot swap function.
X X X X H
1 0 0 0 H
0 0 0 0 H
2 0 0 0 H
(boot cluster 0)
User program
Boot program
User program
Boot
Note
Self-programming
to boot cluster 1
Self-programming
to boot cluster 0
, which is a boot program area, by self-programming, write a new boot program to
Figure 24-20. Boot Swap Function
CHAPTER 24 FLASH MEMORY
X X X X H
1 0 0 0 H
0 0 0 0 H
2 0 0 0 H
User’s Manual U17554EJ4V0UD
New boot program
New boot program
New boot program
(boot cluster 1)
(boot cluster 0)
(boot cluster 1)
(boot cluster 0)
User program
Boot program
User program
Boot
Boot
Execution of boot
swap by firmware
Execution of boot
swap by firmware
New boot program
New boot program
New boot program
(boot cluster 1)
(boot cluster 0)
(boot cluster 1)
(boot cluster 0)
User program
Boot program
User program
Boot
Boot
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