SH7055S Datasheet, PDF (809/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

(Bit rate adjustment)
H'00 to H'00 reception
Boot mode initiation
(reset by boot mode)
H'55 ^reception
Bit rate adjustment
1
2
Wait for inquiry
setting command
Inquiry command reception
Processing of
inquiry setting
command
Inquiry command response
All user MAT and
3
user boot MAT erasure
Read/check command
Wait for
reception
Processing of
4
programming/erasing
read/check command
command
Command response
Erasure selection command reception
Program end notice
Erasure end notice
Erase-block specification
Program selection command
reception
Program data transmission
Wait for erase-block
data
Wait for program data
Figure 22.8 Overview of Boot Mode State Transition
22.5.2 User Program Mode
The user MAT can be programmed/erased in user program mode. (The user boot MAT cannot be
programmed/erased.)
Programming/erasing is executed by downloading the program in the microcomputer.
The overview flow is shown in figure 22.9.
High voltage is applied to internal flash memory during the programming/erasing processing.
Therefore, transition to reset or hardware standby mode must not be executed. Doing so may cause
damage or destroy flash memory. If reset is executed accidentally, the reset signal must be
released after the reset input period, which is longer than the normal 100 µs.
Rev.2.0, 07/03, page 771 of 960