CMOSTEK CMT2300A - GPIO and Interrupt Configuration

CMT2300A
Rev 1.0 | Page32/46
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crystal start-up and settled time. Switching from other state to TFS will be completed immediately.
 RX State
All modules on the receiver will be opened in RX state. Switching from RFS to RX requires only 20us. Switching from STBY to RX
needs to add the PLL calibration and settled time of 350us. Switching from SLEEP to RX needs to add the crystal start-up and
settled time. TX can be quickly switched to RX by sending go_switch command. Whether the TX and RX setting frequency is the
same, the user need to wait for the PLL re-calibration and settled time of 350us to switch successfully.
 TX State
All modules on the transmitter will be opened in TX state. Switching from TFS to TX requires only 20us. Switching from STBY to
TX needs to add the PLL calibration and settled time of 350us. Switching from SLEEP to TX needs to add the crystal start-up and
settled time. RX can be quickly switched to TX by sending go_switch command. Whether the RX and TX setting frequency is the
same, the user need to wait for the PLL re-calibration and settled time of 350us to switch successfully.
5.4 GPIO and Interrupt
CMT2300A has 3 GPIO ports.Each GPIO can be configured as a different input or output. CMT2300A has 2 interrupt ports. They
can be configured to different GPIO outputs.
Table 17. CMT2300A GPIO
Pin No.
Name
I/O
Function
16
GPIO1
IO
Configuredas:DOUT/DIN, INT1, INT2, DCLK (TX/RX), RF_SWT
15
GPIO2
IO
Configuredas:INT1, INT2, DOUT/DIN, DCLK (TX/RX), RF_SWT
8
GPIO3
IO
Configuredas:CLKO, DOUT/DIN, INT2, DCLK (TX/RX)
Interrupt mapping table is as below. INT1 and INT2 mapping is the same. Take INT1 as an example.