Renesas RL78 Series User Manual page 638

RL78/G1D
(5) RF transmission mode
This mode is for transmitting packets. After going through SETUP_RF mode, a packet is transmitted at the
transmission timing of the event period. After packet transmission has been completed, IDLE_RF mode is entered
automatically.
(6) RF reception mode
This mode is for receiving packets. After going through SETUP_RF mode, a packet is received at the reception
timing of the event period. After packet reception has been completed, IDLE_RF mode is entered automatically.
(7) SETUP_RF mode
This is the setup period for starting up the analog circuit and making it able to perform packet
transmission/reception successfully. After setup has been completed successfully, RF transmission mode or RF
reception mode is entered automatically by an event.
15.4.2 RF standby modes
There are the following six modes for the RF standby mode.
(1) POWER_DOWN mode
(2) RESET_RF mode
(3) STANDBY_RF mode
(4) IDLE_RF mode
(5) DEEP_SLEEP mode
(6) SLEEP_RF mode
(1) POWER_DOWN mode
The first mode to be entered after power is supplied. Though power is being supplied, it is not yet being supplied
to the internal circuits. All digital pins of the RF unit are in the high-impedance state and only the RFCTLEN pin
(input pin) can accept input signals.
The RF unit consumes the least power in this mode. Input of the low level on the RFCTLEN pin causes a transition
to this mode from any state.
(2) RESET_RF mode
In this mode, power is not supplied to the internal circuits other than the RF slow clock generator and RF reset
circuits. All digital pins of the RF unit other than the RFCTLEN and EXSLK_RF pins are in the high-impedance
state.
This mode can be entered from the following two states.
● In POWER_DOWN mode, when the RFCTLEN pin input changes from low to high, this mode is entered.
● In STANDBY_RF mode, when the CE_RF internal pin input changes from high to low, this mode is entered.
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
CHAPTER 15 RF TRANSCEIVER
617