HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 538

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

506
User programming mode
1. Initial state
3. Flash memory initialization
(1) The program that will transfer the on-board
update routine to on-chip RAM should be
written into the flash memory by the user
beforehand. (2) The on-board update routine
should be prepared in the host or in the flash
memory.
The update routine in RAM is executed, and
the flash memory is initialized (to H'FF).
Erasing can be performed in block units, but
not in byte units.
H8/3437SF
H8/3437SF
Transfer program
Transfer program
Application program
Flash memory
Flash memory
Flash memory
Boot program
Boot program
(old version)
erase
On-board update routine
New application
New application
program
program
Host
Host
Figure 21.4 User Programming Mode (Example)
On-board update routine
RAM
RAM
SCI
SCI
4. Writing new application program
2. On-board update routine transfer
Next, the new application program in the host is
written into the erased flash memory blocks. Do
not write to unerased blocks.
The transfer program in the flash memory is
executed, and the on-board update routine is
transferred to RAM.
H8/3437SF
H8/3437SF
Transfer program
Transfer program
Application program
New application
Flash memory
Flash memory
Boot program
Boot program
(old version)
program
New application
program
Host
Host
:
Program execution state
On-board update routine
On-board update routine
RAM
RAM
SCI
SCI