CMT2380F64
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Rev 0.3 | 45 / 83
TIM3_ETR
I
Timer 3 external trigger input signal
RF_SDA
33
[3]
40
[3]
IO
RFSPI data I/O, external requires10
kΩ pull-up resistance
or MCU port configuration internal pull-up
PB4
IO
MCU port PB 4
SPI1_MISO
IO
SPI1 master input /slave output signal
TIM3_CH1
IO
Timer 3 I/O channel 1
EVENT_OUT
O
Event output
TIM8_BKIN
I
Timer 8 break input signal
LPUART_RX
I
RxD of LPUART
LPTIM_OUT
O
LP Timer output signal
RF_CSB
34
[3]
41
[3]
I
RF SPI access register selection
PB6
IO
MCU port PB 6
I2C1_SCL
O
I2C1 serial clock signal
USART1_TX
O
TxD of USART1
TIM8_CH1N
O
Reverse output of Timer 8 channel 1
TIM8_CH3
IO
Timer8 I/O channel 3
LPTIM_ETR
I
LP Timer external trigger signal
RF_FCSB
35
[3]
42
[3]
I
RF SPI access FIFO selection
PB7
IO
MCU port PB7
I2C1_SDA
IO
I2C1 serial data signal
USART1_RX
I
RxD of USART1
TIM8_CH2N
O
Reverse output of Timer 8 channel 2
LPUART_CTS
I
Clearing signal is received in flow control of LPUART
LPUART_RX
I
RxD of LPUART
LPTIM_IN2
I
LP Timer input signal channel 2
TIM8_CH4
IO
Timer8 I/O channel 4
BOOT0
-
43
Boot memory selection
PB8
-
44
IO
MCU port PB13
I2C1_SCL
O
I2C1 serial clock signal
TIM8_CH1
IO
Timer8 I/O channel 1
NC
36
-
-
No connection
XI
37
45
I
26 MHz crystal circuit input
XO
38
46
O
26 MHz crystal circuit output
GPIO2
39
[2]
47
[2]
IO
RFmodule GPIO 2, configuredas
：
INT 1
，
INT 2
，
DOUT/DIN
，
DCLK(TX/RX),
RF_SWT
GPIO1
40
[2]
48
[2]
IO
RF module GPIO 1, configuredas
：
DOUT/DIN
，
INT 1
，
INT 2
，
DCLK (TX/RX),
RF_SWT
Notes
：
[1]. INT1 and INT2 are RF interrupts; DOUT is demodulation data output; DIN is the modulation data input; DCLK is a
modulation or demodulation data rate synchronization clock that can automatically switches whenever TX/RX mode.
[2]. GPIO0, GPIO1, and GPIO2 of RF module are not connected to MCU ports. Users need to select suitable MCU ports for
off-chip connection according to the requirements of the system scheme (that is, connecting on PCB board);
[3]. The SPI of RF module (RF_FCSB, RF_CSB, RF_SDA, RF_SCLK) is connected to MCU ports (PB7, PB6, PB4, PB3). It is
recommended that users do not reuse these four ports and only operate as SPI of RF. If the reuse of these MCU ports is
considered, the impacts of SPI ports of RF modules should be considered and analyzed in combination with actual scenarios.
