SH7014 Datasheet, PDF (539/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. 128 kB Flash Memory (F-ZTAT)
18.6.1 Boot Mode
When boot mode is used, the flash memory programming control program must be prepared in the
host beforehand. The SCI to be used is set to channel asynchronous mode.
When a reset-start is executed after the SH7017 pins have been set to boot mode, the boot program
built into the SH7017 is started and the programming control program prepared in the host is
serially transmitted to the SH7017 via the SCI. In the SH7017, the programming control program
received via the SCI is written into the programming control program area in on-chip RAM. After
the transfer is completed, control branches to the start address of the programming control
program area and the programming control program execution state is entered (flash memory
programming is performed).
The transferred programming control program must therefore include coding that follows the
programming algorithm given later.
The system configuration in boot mode is shown in figure 18.8, and the boot mode execution
procedure in figure 18.9.
SH7017
Flash memory
Host
Write data reception
Verify data transmission
RXD1
SCI1
TXD1
On-chip RAM
Figure 18.8 System Configuration in Boot Mode
Rev.5.00 Sep. 27, 2007 Page 505 of 716
REJ09B0398-0500