RL78/G1C Utilising I²C in Slave Mode for Cubesuite+

RL78/G1C Utilising I²C in Slave Mode for Cubesuite+
APPLICATION NOTE
RL78/G1C
Utilising I²C in Slave Mode for Cubesuite+
R01AN1737EG0100
Rev.1.00
Nov 11, 2013
Introduction
The purpose of this Application Note is to show the user how to add the associated RL78/G1C sample code to a new or
existing CubeSuite+ workspace; as well as give an explanation of what the sample code does.
The sample code provided with this Application Note demonstrates usage of the I2C Interface in Slave Mode. The
program runs on the RL78/G1C RSK and demonstrates usage by simulating an EEPROM memory device, similar to the
Renesas R1EX24xxx series.
Target Device
RL78/G1C
Development environment
IDE: Cubesuite+
Compiler: CA78K0R
Hardware: Renesas Starter Kit for RL78/G1C
Contents
1.
Installation ......................................................................................................................................... 2
2.
Creating the Project Workspace ....................................................................................................... 2
3.
Opening Sample Code and Source Files .......................................................................................... 4
4.
Source Code Functionality ................................................................................................................ 4
5.
Code Execution ................................................................................................................................. 5
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Nov 11, 2013
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RL78/G1C
1.
Utilising I²C in Slave Mode for Cubesuite+
Installation
This section assumes CubeSuite+ IDE is already installed on the user’s personal computer (PC). Create a new folder
and name it as ‘RSKRL78G1C_Workspace’. Copy the zipped file an_r01an1737eg0100_rl78g1c_iic.zip’, available in
the Application Note package downloaded from the website, to this folder. Extract the IIC_Slave.zip file to the
RSKRL78G1C_Workspace folder.
2.
Creating the Project Workspace
Open CubeSuite+ IDE by clicking the Windows Start button, select All Programs > Renesas Electronics CubeSuite+ >
CubeSuite+.
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RL78/G1C
Utilising I²C in Slave Mode for Cubesuite+
From the menu bar select File > Project > Open Project…
CubeSuite+ will open a dialog.
Navigate to the unzipped IIC_Slave folder located in RSKRL78G1C_Workspace.
Select the IIC_Slave.mtpj file.
Click <Open>
A Progress Status dialog will appear briefly whilst CubeSuite+ loads the project.
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RL78/G1C
3.
Utilising I²C in Slave Mode for Cubesuite+
Opening Sample Code and Source Files
Once the project has been opened, the source code and all dependant files can be opened in the editor by expanding the
folders in the Project Tree window and double clicking the files listed. All files have been grouped according to their
file type.
4.
Source Code Functionality
The source code project is specifically written to run on the appropriate RSK. However this source code can be useful
as an example even without the RSK.
The project was written using source files containing API functions generated using Code Generator. The project will
contain a C source file ‘r_cg_main.c’. This source file includes the C function main(). All source files and dependant
files whose filenames are prefixed with ‘r_’ were generated using Application Leading Tool.
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Nov 11, 2013
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RL78/G1C
5.
Utilising I²C in Slave Mode for Cubesuite+
Code Execution
Demonstrates usage of the IIC interface in slave mode, by simulating an EEPROM memory device similar to the
Renesas R1EX24xxx series. The memory capacity is 8 bytes. The IIC interface is configured to respond when
addressed with the slave device address 0xA0.
Modifications:
The IIC pull-up resistors are connected to Board_VDD by default. This is correct for power configurations where
Board_VDD is 5V. For power configurations where Board_VDD is 3.3V, the IIC pull-up resistors should be connected
to Board_5V, by removing R83 and fitting R84.
Please refer to the schematics document and component placement diagram in the User Manual to help locate
components.
Instructions:
1. Connect a compatible EEPROM memory device as follows:
EEPROM | RSK
SDA
-> SDA (JA1, pin 25)
SCL
-> SCL (JA1, pin 26)
GND
-> Any ground point.
(Ensure the device is powered as its datasheet specifies)
2. Build and download the sample code to the RSK.
3 Open the 'Watch' window from the menu bar: View > Watch > Watch 1 Add the 'g_master_data' global variable to the
'Watch 1' window by right-clicking on the variable and selecting Register to Watch 1'. The variable will act as the
simulated EEPROM memory.
4. Click 'Go' to start the program execution. "IIC S" will be displayed on the debug LCD.
5. When a valid read request is sent from a master device, the RSK will respond correctly and display "RD" on the
debug LCD.
6. When a valid write request is sent from a master device, the RSK will store the write data into the simulated
EEPROM memory, and display "WR" on the debug LCD.
7. If the RSK displays "ERR", it means the program has detected a failed IIC transmission. Reset both the master slave
devices and retry.
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RL78/G1C
Utilising I²C in Slave Mode for Cubesuite+
Website and Support
Renesas Electronics Website
http://www.renesas.com/
Inquiries
http://www.renesas.com/contact/
All trademarks and registered trademarks are the property of their respective owners.
R01AN1737EG0100 Rev.1.00
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Revision History
Description
Rev.
Date
Page
Summary
1.00
Nov 11, 2013
—
First edition issued
A-1
General Precautions in the Handling of MPU/MCU Products
The following usage notes are applicable to all MPU/MCU products from Renesas. For detailed usage notes on the
products covered by this document, refer to the relevant sections of the document as well as any technical updates that
have been issued for the products.
1. Handling of Unused Pins
Handle unused pins in accord with the directions given under Handling of Unused Pins in the manual.
⎯ The input pins of CMOS products are generally in the high-impedance state. In operation with an
unused pin in the open-circuit state, extra electromagnetic noise is induced in the vicinity of LSI, an
associated shoot-through current flows internally, and malfunctions occur due to the false
recognition of the pin state as an input signal become possible. Unused pins should be handled as
described under Handling of Unused Pins in the manual.
2. Processing at Power-on
The state of the product is undefined at the moment when power is supplied.
⎯ The states of internal circuits in the LSI are indeterminate and the states of register settings and
pins are undefined at the moment when power is supplied.
In a finished product where the reset signal is applied to the external reset pin, the states of pins
are not guaranteed from the moment when power is supplied until the reset process is completed.
In a similar way, the states of pins in a product that is reset by an on-chip power-on reset function
are not guaranteed from the moment when power is supplied until the power reaches the level at
which resetting has been specified.
3. Prohibition of Access to Reserved Addresses
Access to reserved addresses is prohibited.
⎯ The reserved addresses are provided for the possible future expansion of functions. Do not access
these addresses; the correct operation of LSI is not guaranteed if they are accessed.
4. Clock Signals
After applying a reset, only release the reset line after the operating clock signal has become stable.
When switching the clock signal during program execution, wait until the target clock signal has
stabilized.
⎯ When the clock signal is generated with an external resonator (or from an external oscillator)
during a reset, ensure that the reset line is only released after full stabilization of the clock signal.
Moreover, when switching to a clock signal produced with an external resonator (or by an external
oscillator) while program execution is in progress, wait until the target clock signal is stable.
5. Differences between Products
Before changing from one product to another, i.e. to a product with a different part number, confirm
that the change will not lead to problems.
⎯ The characteristics of an MPU or MCU in the same group but having a different part number may
differ in terms of the internal memory capacity, layout pattern, and other factors, which can affect
the ranges of electrical characteristics, such as characteristic values, operating margins, immunity
to noise, and amount of radiated noise. When changing to a product with a different part number,
implement a system-evaluation test for the given product.
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