R01UH0823EJ0100 Rev.1.00
Page 1482 of 1823
Jul 31, 2019
RX23W Group
42. Trusted Secure IP (TSIP-Lite)
42.2
Operation
42.2.1
Operating Modes and State Transitions
shows the state transitions of the TSIP-Lite.
Use of the TSIP-Lite security functions is only possible through use of the TSIP-Lite library provided by Renesas
Electronics, in accordance with the state transitions as shown in the figure below.
When irregular access to the TSIP-Lite (access that violates the defined procedure) due to a falsified program or a
program entering runaway execution, etc. is attempted, the access management circuit does not accept any subsequent
access and stops the output of any data from the TSIP-Lite.
Figure 42.2
TSIP-Lite Operating Modes and State Transitions
Many of the security functions that the TSIP-Lite offers are applicable only in the encryption engine active mode. The
operations that can be performed in this mode are given below.
(1) Key Installation
(2) Encryption and decryption
(3) Key generation
(4) Random number generation
Software standby mode
Irregular access detected
state
Self-diagnosis mode
Random number generator
entropy estimation mode
Encryption engine
active mode
Reset
TSIP-Lite disabled mode
TSIP-Lite enabled mode