Renesas M16C/26A Datasheet

Programming Flash Memory via Flash-Over-USB™
1.0 Abstract
The following article describes using a synchronous serial port and the FoUSB (Flash-over-USB™) Programmer
application to program the user flash memory of the M16C/26 series of microcontrollers. This is referred to in the
M16C/26 datasheet as the “Standard Serial I/O Mode 1” method of flash programming.
2.0 Introduction
The Renesas M16C/26 is a 16-bit MCU based on the M16C/60 series CPU core. The peripheral set includes
10-bit A/D, UARTs, Timers, DMA, and GPIO. The MCU features include up to 64K bytes of Flash ROM, 2K bytes
of RAM, and 4K bytes of virtual EEPROM. The flash memory is divided into several blocks as shown in Figure 1,
and so, allows memory to be erased one block at a time.
Block B: 2KB
Block A: 2KB
Block 3: 32KB
Block 2: 16KB
Part No.
Block 3 Size
Start Address
0 KB
0 KB
Part No.
Block 2 Size
Start Address
Block 1: 8KB
Block 1: 8KB
User ROM Area
Boot ROM Area
Figure 1 M16C/26 Flash Memory Map
The M16C/26 flash memory can be programmed with a single voltage. Three flash memory modes are available
in which to read, program and erase: (1) parallel I/O and (2) serial I/O modes in which the flash memory can be
manipulated using a programmer and (3) CPU rewrite mode in which the flash memory can be manipulated by
the Central Processing Unit (CPU). The Standard Serial I/O Mode can be further divided into a synchronous
mode (Standard Serial I/O Mode 1) and an asynchronous mode (Standard Serial I/O Mode 2). The standard
serial I/O mode inputs and outputs the software commands, addresses and data needed to operate (read,
program, erase, etc.) the internal flash memory using the serial I/O port UART1.
The flash memory is divided into two major blocks, a user program area and a boot ROM area. The user program
area is used for user application program and data. The boot ROM area has a control program stored in it when
shipped from the factory and can only be accessed when a special hardware reset sequence is initiated. This
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Programming Flash Memory via Flash-Over-USB™
program allows asynchronous or synchronous serial programming of the user area of the flash and can only be
changed by using Parallel I/O Mode.
Renesas provides a Windows based program, Flash-Over-USB™ (FoUSB), to download code to M16C/26
MCUs. FoUSB Programmer is used along with the USB-Monitor (see Figure 3) for reprogramming the flash
memory of a M16C/26 microcontroller over USB (Universal Serial Bus).
Figure 2 M16C/26 Flash Memory Map
Host PC running
FoUSB Programmer
Figure 3 M16C System Connectivity for FoUSB Programmer
3.0 Hardware Requirements for Synchronous Serial Programming
The CNVSS pin on the M16C MCU is the primary control line that determines whether the user area or the boot
area of the flash memory is accessed after reset is released. If the CNVSS pin is low the device will always
access the user flash area and will start in single chip mode. To execute the synchronous serial rewrite program
in the boot area of the flash, the CNVSS pin has to be held high. The operation uses the four UART1 pins of the
MCU: CLK1 (P65), RxD1 (P66), TxD1 (P67) and RTS1 (P64). The CLK1 pin is the transfer clock input pin through
which a 1MHz clock is fed to the MCU from the USB monitor for synchronous data input to the RxD1 pin. The
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Programming Flash Memory via Flash-Over-USB™
TxD1 pin is for CMOS output from the MCU. The RTS1 (BUSY) pin outputs a low level when ready for data
reception and a high level when reception starts.
Since the USB-Monitor uses the Renesas factory boot code to communicate with the target MCU, the proper pin
connections should be considered on your target board design. An example connection for the M16C/26 is
shown in Figure 4.
P6_4/RTS1 (Busy)
P6_5/CLK1 (SCLK)
P6_6/RxD1 (RxD)
P8_6/XCout (CE)
P6_7/TxD1 (TxD)
Figure 4 A typical M16C/26 target board hardware connection for FoUSB Connectivity
When the USB-Monitor is connected to a computer for the first time, Windows will recognize the new hardware
and will request for the drivers. The drivers were already installed during the install, for example, if the installation
directory is ‘C:\MTOOL\FOUSB’, then the required device driver will be located in ‘C:\MTOOL\FOUSB\Device
Drivers\’ and needs to be pointed to if asked by Windows. For Windows XP, a dialog box is displayed warning
that the driver has not been tested for Windows XP compatibility. This warning message should be disregarded
and continue driver installation.
4.0 Using the FoUSB Programmer
The main steps that need to be followed for programming the flash memory of an M16C/26 MCU chip using
FoUSB are described below. The name of a button or option that has to be clicked or selected is written in bold
italics. All other items extracted from the programmer software GUI (Graphical User Interface) appears in normal
italics. Sections 4.1 to 4.4 covers buttons and options that are absolutely essential for flash programming of an
MCU. Description of all buttons or options that are available in the various windows of FoUSB can be found in the
Help section that can be invoked by clicking on HELP on the FoUSB main GUI shown in Figure 5.
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Programming Flash Memory via Flash-Over-USB™
4.1 Starting FoUSB
Connect a USB-Monitor to the M16C/26 target board and then connect the USB cable to the PC as shown in
Figure 4. To start FoUSB, double-click on 'fousb' icon on your desktop or select Flash-over-USB from the Start
menu (Start > Programs > Renesas-Tools > Flash-over-USB ver. 1.xx > Flash-over-USB). A connection dialog
box will appear as shown in Figure 5. Click OK and the main GUI of the FoUSB program will appear as shown in
Figure 6. USB Monitor Device appears on the FoUSB main GUI indicating that the USB monitor has been
properly connected.
Figure 5 USB Monitor connection dialog box
Figure 6 FoUSB main GUI
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Programming Flash Memory via Flash-Over-USB™
4.2 Selecting Target MCU
To select the firefly as target MCU, perform the following steps.
1. Click on Select MCU on the FoUSB main GUI. A Chip Selection GUI appears as shown in Figure 7.
2. Click on M16C/26 from the Select MCU Family option. M30262F8_DBC appears as a part number in the
Select MCU Part Number option.
3. Click on M30262F8_DBC under Select MCU Part Number to highlight it. Then press OK. This selects the
target firefly MCU chip and the Chip Selection GUI disappears. The selected MCU (M30262F8_DBC)
appears on the start-up GUI besides Select MCU as shown in Figure 6.
Figure 7 Chip Selection GUI
4.3 Selecting Target Program
To select a target program, perform following steps:
1. Click on OPEN on FoUSB main GUI. Windows file selection menu appears as shown in Figure 8.
2. Find the target file (e.g., xxxx.mot) for loading into MCU flash, highlight the file, and then click on Open of
Windows file selection menu. The target file is thereby selected and the file selection menu disappears. The
selected target file appears on FoUSB main GUI beside FILE as shown in figure 9.
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Programming Flash Memory via Flash-Over-USB™
Figure 8 Dialog box for file selection
Figure 9 FoUSB main GUI after file selection
4.4 Loading Target Program
To load the selected target program into the MCU flash, perform the following steps:
1. Click on PROGRAM on FoUSB main GUI. The Program Flash dialog box appears as shown in Figure 10.
2. Select Erase->Program->Verify option (the default option) from Choose an Operation.
3. Select Erase All Block option from Erasing Options.
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Programming Flash Memory via Flash-Over-USB™
4. Click on Program of the Program Flash GUI. The loading of target program into MCU flash will start at this
point and the progress of flash programming will be shown dynamically by a moving bar located at the lower
part of this dialog box. After a successful programming of the flash, a Program Completed Successfully
dialog box will appear as shown in Figure 11.
5. Click on OK button and the dialog box disappear (nd back to the FoUSB main GUI).
Figure 10 Menu options for programming flash
Figure 11 Dialog box after a successful flash programming
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Programming Flash Memory via Flash-Over-USB™
4.5 Exiting FoUSB Programmer
To exit from FoUSB, click on EXIT or the X button on the upper right corner of the main GUI.
5.0 Reference
Renesas Technology Corporation Semiconductor Home Page
E-mail Support
Data Sheets
• M16C/26 datasheet, M30262eds.pdf
User’s Manual
• MSV30262-SKP Users Manual, Users_Manual_MSV30262.pdf
• MSV30262-SKP Quick start guide, Quick_Start_guide_MSV30262.pdf
• Flash-Over-USB Help menu
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Remember to give due consideration to safety when making your circuit designs, with appropriate
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