Low Power Consumption Modes; Sleep Mode; Entry To Sleep Mode - Renesas RX100 Series User Manual

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Low Power Consumption Modes

When the WAIT instruction is executed while the SBYCR.SSBY bit is 0, the CPU enters sleep mode. In sleep mode, the

CPU stops operating but the contents of its internal registers are retained. Other peripheral functions do not stop.

Counting by the IWDT stops if a transition to sleep mode is made while the IWDT is being used in auto-start mode and

the OFS0.IWDTSLCSTP bit is 1. In the same way, counting by the IWDT stops if a transition to sleep mode is made

while the IWDT is being used in register start mode and the IWDTCSTPR.SLCSTP bit is 1.

Furthermore, counting by the IWDT continues if a transition to sleep mode is made while the IWDT is being used in

auto-start mode and the OFS0.IWDTSLCSTP bit is 0 (counting by the IWDT continues through transitions to low power

consumption modes). In the same way, counting by the IWDT continues if a transition to sleep mode is made while the

IWDT is being used in register start mode and the IWDTCSTPR.SLCSTP bit is 0.

To use sleep mode, make the following settings and then execute a WAIT instruction.

(1) Set the PSW.I bit *

of the CPU to 0.

(2) Set the interrupt request destination *

(3) Set the priority *

of the interrupt to be used for exit from sleep mode to a level higher than the setting of the

PSW.IPL[3:0] bits *

(4) Set the IERm.IENj bit *

(5) Read the I/O register that is written last and confirm that the written value has been reflected.

(6) Execute the WAIT instruction (this automatically sets the I bit *

Note 1. For details, refer to section 2, CPU.

Note 2. For details, refer to section 14.4.3, Selecting Interrupt Request Destinations.

Note 3. For details, refer to section 14, Interrupt Controller (ICUb).

R01UH0822EJ0100 Rev.1.00

Jul 31, 2019

to be used for exit from sleep mode.

to 1 for the interrupt.

11. Low Power Consumption

in the PSW of the CPU to 1).

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