SH7125_08 Datasheet, PDF (627/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Flash Memory
17.5 On-Board Programming Mode
When the pin is set in on-board programming mode and the reset start is executed, the on-board
programming state that can program/erase the on-chip flash memory is entered. On-board
programming mode has two operating modes: user program mode and boot mode.
For details on the pin setting for entering each mode, see table 17.1. For details on the state
transition of each mode for flash memory, see figure 17.2.
17.5.1 Boot Mode
Boot mode executes programming/erasing user MAT by means of the control command and
program data transmitted from the host using the on-chip SCI. The tool for transmitting the control
command and program data must be prepared in the host. The SCI communication mode is set to
asynchronous mode. When reset start is executed after this LSI's pin is set in boot mode, the boot
program in the microcomputer is initiated. After the SCI bit rate is automatically adjusted, the
communication with the host is executed by means of the control command method.
The system configuration diagram in boot mode is shown in figure 17.6. For details on the pin
setting in boot mode, see table 17.1. Although NMI and other interrupts are ignored in boot mode,
do not generate them.
This LSI
Host
Boot
programming
tool and program
data
Control command, program data
Reply response
Control command,
analysis execution
software (on-chip)
RXD1
On-chip SCI1
TXD1
Flash
memory
On-chip RAM
Figure 17.6 System Configuration in Boot Mode
Rev. 4.00 Jul. 25, 2008 Page 607 of 750
REJ09B0243-0400