CMOSTEK CMT2300A - Receiver Specifications

AN146
Rev 0.9 | Page 6/25
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Register
Name
Bits
R/W
Bit Name
Function Description
3：NA
1:0
RW
RX_EXIT_STATE<1:0>
Automatically exit to the preset status after
receiving,it is only valid in the packet mode
and enabling RX Timer, otherwise the chip
will not automatically exit from the RX status,
but wait for the MCU to send go_* command
to switch.
0：SLEEP
1：STBY
2：RFS
3：NA
CUS_SYS4
(0x0F)
7:0
RW
SLEEP_TIMER_M<7:0>
Define the timing time for SLEEP TIMER,
formula as follows：
T = M x 2^(R+1) x 31.25 us
CUS_SYS5
(0x10)
6:4
RW
SLEEP_TIMER_M<10:8>
3:0
RW
SLEEP_TIMER_R<3:0>
CUS_SYS6
(0x11)
7:0
RW
RX_TIMER_T1_M<7:0>
Define the timing time for RX T1 TIMER,
formula as follows:
T = M x 2^(R+1) x 20 us
CUS_SYS7
(0x12)
6:4
RW
RX_TIMER_T1_M<10:8>
3:0
RW
RX_TIMER_T1_R<3:0>
CUS_SYS8
(0x13)
7:0
RW
RX_TIMER_T2_M<7:0>
Define the timing time for RX T2 TIMER,
formula as follows:
T = M x 2^(R+1) x 20 us
CUS_SYS9
(0x14)
6:4
RW
RX_TIMER_T2_M<10:8>
3:0
RW
RX_TIMER_T2_R<3:0>
1.2 RX Duty-Cycle Mode
To control the RX Duty-Cycle mode, 4 register control bits are used. According to the actual application
requirements, here are 5 combinations of the 4 control bits and the corresponding operation mode.
In the following status diagram, the gray line indicates that the MCU manually sends the go_* command
to switch the status, the blue line indicates the chip automatic status switching. Note that switching from the
status A to the status B, once the blue line exists, the gray line cannot exist, and the reverse is also the case.
That is, if the automatic control is adopted, the MCU is not allowed to use the manual control, otherwise it will
disturb the chip operation, there may be a crash situation. If you use the manual switching, the automatic
switching cannot be enabled.
1.2.1 Control Full Manually
Controlling full manually means not opening any Duty-Cycle control.
Table 4. Control Full Manually
Control Bit
Value
SLEEP_TIMER_EN
0
RX_DC_EN
0
RX_TIMER_EN
0
RX_EXIT_STATE
0