r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 944

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 22 Flash Memory
22.5
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 three operating modes: user program mode, user boot mode, and boot
mode.
For details on the pin setting for entering each mode, see table 22.1. For details on the state
transition of each mode for flash memory, see figure 22.2.
22.5.1
Boot mode executes programming/erasing user MAT and user boot 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 22.6. For details on the pin
setting in boot mode, see table 22.1. Interrupts are ignored in boot mode so do not generate them.
Rev. 1.00 Sep. 21, 2007 Page 918 of 1124
REJ09B0402-0100
On-Board Programming Mode
Boot Mode
tool and program
programming
Host
Boot
data
Figure 22.6 System Configuration in Boot Mode
Control command, program data
Reply response
analysis execution
Control command,
software (on-chip)
RXD1
TXD1
On-chip SCI1
This LSI
On-chip RAM
memory
Flash