SH7065 Datasheet, PDF (765/941 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Section 19 256 kB Flash Memory (F-ZTAT)
19.6.1 Boot Mode
When boot mode is used, the flash memory programming control program must be prepared in the
host beforehand. The SCI channel to be used is set to asynchronous mode.
When a reset start is executed after the SH7065 pins have been set to boot mode, the boot program
built into the SH7065 is started and the programming control program prepared in the host is
serially transmitted to the SH7065 via SCI channel 2 (RxD2 (PG31), TxD2 (PG30)). In the
SH7065, the user program received via SCI channel 2 is written into the user program area in on-
chip RAM. After the transfer is completed, control branches to the start address of the user
program area and the user program execution state is entered (flash memory programming is
performed). The transferred user program must therefore include coding that follows the
programming algorithm given later.
The system configuration in boot mode is shown in figure 19.8, and the boot program mode
execution procedure in figure 19.9.
SH7065
Flash memory
Host
Write data reception
Verify data transmission
RxD2(PG31)
SCI2
TxD2(PG30)
On-chip
RAM
Figure 19.8 System Configuration in Boot Mode
Rev. 5.00 Sep 11, 2006 page 743 of 916
REJ09B0332-0500