UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 662

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

25.7.1 Boot swap function
overwriting is disabled due to data destruction in the boot area.
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/Kx2-L microcontrollers, 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.
In an example of above figure, it is as follows.
662
X X X X H
1 0 0 0 H
0 0 0 0 H
2 0 0 0 H
If rewriting the boot area failed by temporary power failure or other reasons, restarting a program by resetting or
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
Note A boot cluster is a 4 KB area and boot clusters 0 and 1 are swapped by the boot swap function.
Caution The boot swap function can be used only in the products whose ROM size is more than 16 KB.
Boot cluster 0: Boot program area before boot swap
Boot cluster 1: Boot program area after boot swap
(boot cluster 0)
User program
Boot program
User program
Boot
Self-programming
to boot cluster 1
Note
, which is a boot program area, by self-programming, write a new boot program to
New boot program
(boot cluster 1)
(boot cluster 0)
User program
Boot program
Figure 25-6. Boot Swap Function
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 25 FLASH MEMORY
Boot
Execution of boot
swap by firmware
New boot program
(boot cluster 0)
(boot cluster 1)
User program
Boot program
Boot
Self-programming
to boot cluster 0
New user program
New boot program
(boot cluster 0)
(boot cluster 1)
User program
Boot