RENESAS TOOL NEWS
R20TS0568EJ0100 Rev.1.00 Page 1 of 4
Sep.01.20
[Notes]
Renesas Starter Kit+ for RX72M,
Renesas Starter Kit+ for RX72N
Outline
When using the products in the title, note the following point.
1. Notes on transitions to low power consumption mode of low-power consumption function
1. Notes on transitions to low power consumption mode of low-power consumption
function
1.1 Applicable Products
Product name
Renesas Starter Kit+ for RX72M,
Renesas Starter Kit+ for RX72M (with built-in Trusted Secure IP),
Renesas Starter Kit+ for RX72N,
Renesas Starter Kit+ for RX72N (with built-in Trusted Secure IP)
Applicable item
Sample code in product installers
- Low_Power_Mode
- System_Input_Capture
1.2 Details
The sample codes use 240 MHz ICLK and include transitions to a low power consumption mode (software
standby mode or deep software standby mode), but do not comply with the following notes described in the
User's Manual.
User's Manual
- RX72M Group User’s Manual: Hardware
Document number: R01UH0804EJ0100
- RX72N Group User’s Manual: Hardware
Document number: R01UH0824EJ0100
Notes (Excerpt)
11.7.9 Notes on Transitions from High-Speed Operating Mode to Low-Speed
Operating Mode or to Low Power Consumption Mode
When the operating frequency of ICLK is 70 MHz or higher and the chip is to
be shifted to low-speed operation, or is to be placed on software standby or
deep software standby, change the frequency of ICLK to one quarter of its
current frequency and then wait for 3 μs before initiating the desired transition.
Conversely, if the frequency of ICLK is to be changed to a frequency of 70
MHz or higher at the time of a transition from low-speed operation to high-
speed operation, set the frequency to one quarter of the intended frequency
and then wait for 3 μs before changing it to the intended frequency.
R20TS0568EJ0100
Rev.1.00
Sep. 01, 2020
RENESAS TOOL NEWS
R20TS0568EJ0100 Rev.1.00 Page 2 of 4
Sep.01.20
The following table shows how a transition to a low power consumption mode is handled by the sample
codes for each product.
Renesas Starter Kit+ for RX72M
Renesas Starter Kit+ for RX72M
(with built-in Trusted Secure IP)
Appropriate measures have not been taken for the notes.
Renesas Starter Kit+ for RX72N
Renesas Starter Kit+ for RX72N
(with built-in Trusted Secure IP)
Updating to e
2
studio (V7.8.0 or later) or CS+ (Smart
Configurator V2.5.0 or later) and then regenerating the
code may duplicate the steps for setting ICLK to one
quarter of the intended frequency and then waiting for 3 μs.
1.3 Workarounds
1.3.1 Renesas Starter Kit+ for RX72M,
Renesas Starter Kit+ for RX72M (with built-in Trusted Secure IP)
■For e
2
studio-version sample code
(1) Update e
2
studio to V7.8.0 or later.
(2) With the intended sample code, generate the code from Smart Configurator.
■For CS+ version sample code
(1) Update the Smart Configurator to V2.5.0 or later using the Update Manager.
(2) With the intended sample code, generate the code from Smart Configurator.
1.3.2 Renesas Starter Kit+ for RX72N,
Renesas Starter Kit+ for RX72N (with the built-in Trusted Secure IP)
■For e
2
studio-version sample code
Download and use a fixed version of the sample codes from the following URL.
- Sample codes as attachments to the application note for Renesas Starter Kit+ for RX72N:
https://www.renesas.com/search/keyword-search.html#genre=document&q=r20an0554
Document number: R20AN0554EJ0100
■For CS+ version sample code
Download and use a fixed version of the sample codes from the following URL.
- Sample codes as attachments to the application note for Renesas Starter Kit+ for RX72N:
https://www.renesas.com/search/keyword-search.html#genre=document&q=r20an0555
Document number: R20AN0555EJ0100