HD64F3039F18 Datasheet, PDF (479/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 15 ROM
15.4.1 Boot Mode
When boot mode is used, the flash memory programming control program must be prepared in the
host beforehand. The channel 1 SCI to be used is set to asynchronous mode.
In reset start, after setting this LSI pin to the boot mode, start the microcomputer boot program,
measure the Low period of the data sent from the host, and select the bit rate register (BRR) value
beforehand. Then enable reception of the user program from the outside using the serial
communication interface (SCI) on this LSI, and write the received user program to on-chip RAM.
After the program has been stored the end of writing, execution branches to the top address
(H'FF300) of the on-chip RAM, execute the program written on the on-chip RAM, and enable
flash memory program/erase.
The system configuration in boot mode is shown in figure 15.5, and the boot program mode
execution procedure in figure 15.6.
This LSI
Flash memory
Host
Write data reception
Verify data transmission
RXD₁
SCI1
TXD₁
On-chip RAM
Figure 15.5 System Configuration in Boot Mode
Rev.3.00 Mar. 26, 2007 Page 455 of 682
REJ09B0353-0300