RL78/G1H CHAPTER 2 CONNECTION BETWEEN MCU AND RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 12 of 920
Dec 22, 2016
2.2 Communication Interface Between MCU and RF Transceiver
3-wire serial I/O (CSI) is used for the SPI interface for internal communication between the MCU and RF unit. For
data transfer between the MCU and RF unit, a transfer clock is output from the MCU to the RF unit and data is
transmitted and received. The operation of the 3-wire serial I/O (CSI) is shown in Table 2 - 3.
Caution Use the RL78/G1D so that these conditions and the specifications of the AC characteristics (CHAPTER 31
ELECTRICAL SPECIFICATIONS) are satisfied.
Table 2 - 3 3-Wire Serial IO Between MCU and RF Transceiver
Item CSI20 (dedicated for internal communication)
Target channel Channel 0 of serial array unit 1 (SAU1)
Pins used SCK20, SI20, SO20 (pins for communication/all on-chip dedicated internal pin), and P16 (pin for control
of the SEN pin/on-chip dedicated internal I/O pin)
Operation mode Only transmission mode or transmission/reception mode is supported.
Master/slave Only master is supported.
Interrupt Transfer end interrupt (in single-transfer mode) or buffer empty interrupt (in continuous transfer mode)
can be selected.
Error detection flag Overrun error detection flag (OVF20)
Transfer data length Only 8-bit length is supported.
Transfer rate Within the range that satisfies the AC characteristics of the electrical specifications
Data phase Only Type 1 is supported.
Clock phase Only Type 1 is supported.
Data direction Only MSB first is supported.
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