Renesas Renasas Single-Chip Microcomputer SH7086 Technical Information PDF herunterladen (Seite 88)

Flash Development Toolkit

Method for Using the User Program Mode (SH7086 Application)

REJ06J0071-0100 /Rev.1.00 2009.2 Page 86 of 106

(2) Main process (main)

The flow of the main process is shown below.

1. Branch from the reset vector to start (startup).

2. Start (startup) sets the stack pointer and calls the main process (main).

3. The main process (main) calls SCI initialization (InitSCI) and branches to ROM main process

(RomMain).

4. The ROM main process (RomMain) transfers RAM main process to the RAM and then accepts and

processes commands and sets specification.

When setting is complete, it branches to RAM main process (RamMain) in the RAM.

5. The RAM main process (RamMain) processes received commands to execute the processing listed

below.

Write/erase library transfer (LibTrans)

Erase flash memory (EraseFLASH)

Write to flash memory (WriteFLASH)

User boot area/user area memory read (ReadMemory)

User boot area/user area sum check (SumCheck)

User boot area/user area blank check (CheckBlank)

[Note] The ROM main process (RomMain) is also referred to as the micro kernel. It operates in the

ROM.

The RAM main process (RamMain) is also referred to as the main kernel. It operates in the

RAM.

(3) ROM main process (RomMain)

The flow of the ROM main process (RomMain) is shown below.

1. In transfer start (TransStart), transfer a program from the ROM where it is stored to the RAM.

This is to enable library transfers and write/erases to be processed in the RAM.

2. In command function (CmdFunc), process commands and set selection corresponding to inquiries.

3. Inquiries are handled in the reference function (ReferFunc) and program status (RequestBootPrgSts),

with the following commands supported.

Support device inquiry

Clock mode inquiry

Multiply factor inquiry

Operating clock frequency inquiry

User boot area information inquiry

User area information inquiry

Erase block information inquiry

Write size inquiry

Boot program status inquiry

4. Selection settings are made in the following modules.

Device selection (SelectDevice): Selects device code

Clock mode selection (SelectClockMode): Notifies selected clock mode

New baud rate setting (SetNewBaudRate): Selects new baud rate

5. When inquiry selection is complete, branch to the RAM main process (RamMain) that was transferred

to the RAM.

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