Figure 3-2. Interconnection between SAM L21 and AT86RF212B
SAM L21
AT86RF212B
SAM R30
SERCOM 4
SPI-Client
GCLK
GENERATOR 1
/SEL
MOSI
MISO
SCLK
CLKM
IRQ
CONTROL
LOGIC
PORTx
SLP_TR
/RST
External PA
and POWER
CONTROL
ANTENNA
DIVERSITY
CONTROL
RFCTRL
DIG1
DIG2
DIG3
DIG4
PA20
PB15
PB16
(2)
PB17
(2)
PA10
(2)
PA11
(2)
PC16(F)
(1)
PB00(A)
(1)
PB31(F)
(1)
PAD1
PB30(F)
(1)
PAD2
PC19(F)
(1)
PAD0
PAD3
PC18(F)
(1)
1. Alternate pin function and direction has to be configured by software.
2. Pin function is configured by hardware automatically after reset.
EXTINT1
The SPI is used for register, Frame Buffer, SRAM and AES access. The additional control signals are connected to
the GPIO/IRQ interface of the microcontroller. The following table introduces the radio transceiver I/O signals and
their functionality.
Table 3-1. Microcontroller Interface Signal Description
Signal
Description
/SEL
SPI select signal, active-low
MOSI
SPI data (host output client input) signal
MISO
SPI data (host input client output) signal
SCLK
SPI clock signal
ATSAMR30M18A
Module Block Diagram
©
2018-2021 Microchip Technology Inc.
and its subsidiaries
Datasheet
DS70005384B-page 9