Renesas RL78 Series User Manual page 33

RL78/G1D
Pin Name
MCU unit RF unit
P05 RESET_RF
P06 CE_RF
P70/SCK21 SCK_RF
P71/SI21 SO_RF
P72/SO21 SI_RF
P74 SPIEN_RF
P75 DCDCOFF
P76 EXT32K
P77/INTRF INTOUT_RF
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
CHAPTER 2 CONNECTION BETWEEN MCU AND RF TRANSCEIVER
Table 2-1. Internal Pin Connection
Hardware reset signal for the RF unit (baseband unit). When RESET_RF is at
the low level, the RF unit (baseband unit) enters the reset state. RESET_RF
is controlled by P05 which is an internal port of the MCU.
Chip select signal of the RF unit. When CE_RF is at the high level, the RF
unit is enabled. CE_RF is controlled by P06 which is an internal port of the
MCU.
Operation clock of the SPI interface used for internal communication between
the MCU and RF unit. Since it is dedicated to internal communication, it
cannot be used for communication with external modules.
Data (MCU: input data, RF unit: output data) of the SPI interface used for
internal communication between the MCU and RF unit. Since it is dedicated
to internal communication, it cannot be used for communication with external
modules.
Data (MCU: output data, RF unit: input data) of the SPI interface used for
internal communication between the MCU and RF unit. Since it is dedicated
to internal communication, it cannot be used for communication with external
modules.
Communication enable control signal for the SPI interface (RF unit) used for
internal communication between the MCU and RF unit.
SPIEN_RF is an active-low (SPI communication enabled) signal. SPIEN_RF
is controlled by P74 which is an internal port of the MCU.
Controls whether the DC-DC converter incorporated in RF unit is used or not.
Low level of DCDCOFF specifies DC-DC converter is used, and the high level
specifies unused. DCDCOFF is controlled by P75 which is an internal port of
the MCU block.
Controls whether On-chip oscillator for the RF slow clock incorporated in RF
unit is used or not.
When using On-chip oscillator for the RF slow clock incorporated in RF unit,
use the EXT32K in low level. When On-chip oscillator for the RF slow clock
incorporated in the RF unit is not used, use the EXT32K in high level. The 32-
kHz clock shall be supplied externally (EXSLK_RF pin).
When an interrupt source is generated in the RF unit, that status is output from
the INTOUT_RF pin.
The INTOUT_RF pin is connected to the INTRF pin internally. Thus the MCU
can accept the interrupt status.
Function Direction
MCU →
RF transceiver
MCU →
RF transceiver
MCU →
RF transceiver
RF transceiver →
MCU
MCU →
RF transceiver
MCU →
RF transceiver
MCU →
RF transceiver
MCU →
RF transceiver
RF transceiver →
MCU
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