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6.5.2 Main Processing (main)
The flow of main processing is shown below:
(1) The reset vector causes a branch to start (startup).
(2) Start (startup) sets the stack pointer and calls main processing (main).
(3) Main processing (main) calls SCI initial setting (InitSCI) and branches to ROM main processing (RomMain).
(4) ROM main processing (RomMain) transfers RAM main processing to RAM, receives and processes a command,
and sets items.
After setting items, ROM main processing branches to RAM main processing (RamMain) in RAM.
(5) RAM main processing (RamMain) processes the received commands and performs the following processing:
Transferring the programming/erasing library (LibTrans)
Erasing flash memory (EraseFLASH)
Programming flash memory (WriteFLASH)
Reading memory in the user boot area or user area (ReadMemory)
Calculating a checksum of data in the user boot area or user area (SumCheck)
Checking the blank status of the user boot area or user area (CheckBlank)
Note: ROM main processing (RomMain) is also called a micro-kernel. It runs in ROM.
RAM main processing (RamMain) is also called a main kernel. It runs in RAM.
6.5.3 ROM Main Processing (RomMain)
The flow of ROM main processing (RomMain) is shown below:
(1) Transfer start (TransStart) transfers the program in ROM to RAM.
This operation is for performing library transfer, erasing, and programming in RAM.
(2) Command function (CmdFunc) processes each command, responds to each inquiry, and sets selection.
(3) Reference function (ReferFunc) and program status (RequestBootPrgSts) respond to each inquiry that corresponds
to one of the following commands:
Supported device inquiry
Clock mode inquiry
Multiplication ratio inquiry
Operating frequency inquiry
User boot area information inquiry
User area information inquiry
Erase block information inquiry
Programming unit inquiry
Boot program status inquiry
(4) A selection setting command is set using one of the following modules:
Device selection (SelectDevice): Selects a device code.
Clock mode selection (SelectClockMode): Notifies the selected clock mode.
New bit rate setting (SetNewBaudRate): Selects a new bit rate.
(5) Inquiry/selection processing is completed and a branch is caused to RAM main processing (RamMain) transferred
to RAM.
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- To our customers 1
- Renesas Technology Corp 5
- Contents 6
- 1. Introduction 9
- 2. H8S/2378F (H8S Family) 10
- 3.1 Main Functions 12
- The device is disconnected 43
- The file is removed 46
- The folder is removed 48
- 4.4.4 Selecting a File 54
- 4.5 User Boot Mode 59
- 4.6 User Program Mode 72
- 6. Sample Program 82
- 6.2 Source Files 83
- 6.3 Modules 84
- 6.5 Flow of the Program 88
- 7.1 Header Files 91
- 7.3 RAM Main Processing 96
- 8. Programming Guide 102
- 8.3 Using the Libraries 104
- 8.4 Modules 105
- 8.5 Module Specifications 105
- Flash Development Toolkit 109
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