TWS-900C Instruction

• This instruction is write for matching TRW-400.
• Data Rate
  2.4/4.8/9.6/19.2/38.4/76.8/153.6Kbps
• Current Consumption
  +10dBm output 26.4mA
  0dBm output 15mA
• Dispose
  After power program, restore TWS-900C.
  Wait for 1ms, and then dispose TWS-900C.
  After dispose, enable transmit data to TWS-900C at least 5ms time delay.
• In order to simplify the program, the number of package can not beyond 64 BYTE for once. (In principle, it can have illimitably BYTE.)
• Pin Illustration

• Frequency Formulation
  Frequency value = actual working frequency*2^16/26000000, frequency value address : 0x0D, 0x0E and 0x0F.
  Ex : Working frequency = 434M, frequency value :
  = 434*2^16/26 = 1093947 = 0x10B13B,then
  0x0D = 0x10
  0x0E = 0xB1
  0x0F = 0x3B
• Restore TWS-900C
  Dispose high/low CE, more than 10us time delay.
  Dispose high CE; have to equal or more than 50us T1 time delay.
  Reset instruction : 0x30.
• When CE become low (After T1 time), suggest RD status
  If it shows 1, keep waiting. (if beyond 20ms, indicate bad module.)
  If it shows 0, then transmit reset instruction to RF.
• Wait for RD status after finish reset instruction transmitting
  If it shows 1, make CE to 1 after wait for others turn to 0.
  If it shows 0, make CE to 1.
• After restoration, the are as below

• Write in orders to RF module
  Write in two orders after finish dispose : 0x37/0x33
  Write in two orders before transfer : 0x3B/0x35
  Write in two orders before enter low power consumption : 0x39/0x32
  From low power consumption to normal : Reset, dispose.
  When CE become low, have to wait for RD become low to transfer data to RF.


Graphs of write in orders :

• Dispose data to RF, form : address + data.

Address	Work Rate
	2.4	4.8	9.6	19.2	38.4	76.8	153.6
02H	0x06	0x06	0x06	0x06	0x06	0x06	0x06
04H	0x55	0x55	0x55	0x55	0x55	0x55	0x55
05H	0x55	0x55	0x55	0x55	0x55	0x55	0x55
06H
08H	0x00	0x00	0x00	0x00	0x00	0x00	0x00
0AH	0x00	0x00	0x00	0x00	0x00	0x00	0x00
0DH	0x10	0x10	0x10	0x10	0x10	0x10	0x10
0EH	0xB1	0xB1	0xB1	0xB1	0xB1	0xB1	0xB1
0FH	0x3B	0x3B	0x3B	0x3B	0x3B	0x3B	0x3B
10H	0x86	0x87	0x88	0x89	0x8A	0x8B	0x8C
11H	0x83	0x83	0x83	0x83	0x83	0x83	0x83
12H	0x03	0x03	0x03	0x03	0x03	0x03	0x03
13H	0x02	0x22	0x02	0x02	0x02	0x02	0x02
14H	0xF8	0xF8	0xF8	0xF8	0xF8	0xF8	0xF8
15H	0x02	0x02	0x14	0x24	0x34	0x43	0x53
18H	0x08	0x08	0x08	0x08	0x08	0x08	0x08
22H	0x10	0x10	0x10	0x10	0x10	0x10	0x10
23H	0xA9	0xA9	0xA9	0xA9	0xA9	0xEA	0xEA
24H	0x2A	0x2A	0x2A	0x2A	0x2A	0x2A	0x2A
25H	0x00	0x00	0x00	0x00	0x00	0x00	0x00
26H	0x11	0x11	0x11	0x11	0x11	0x11	0x11
29H	0x59	0x59	0x59	0x59	0x59	0x59	0x59
2CH	0x81	0x81	0x81	0x81	0x81	0x88	0x88
2DH	0x35	0x35	0x35	0x35	0x35	0x31	0x31
2EH	0x0B	0x0B	0x0B	0x0B	0x0B	0x0B	0x0B

• Special description
  0DH , 0EH ,0FH are the address for working frequency.
  06H is the number of BYTE for once package. It will be 0AH if it transfers 10 Units once.
• After reset and write the dispose above in RF, write in two orders : 0x37/0x33
• If would like to know the data in 06H is correct or not, change the address to 0x80 and read RD data, as same as reading others address. The graphs are as same as while write in, reference as below :

• In order to matching TRW-400 transfer data, it have accord with the form below, or TRW-400 can not receive data
  Address + BYTE*n data + checkup code
  Address (BYTE*n) the transfer number have to be the same as RX value.
  Check code (include two BYTE, the value of these two BYTE are the same), 55?address?data. Ex : Transmit address is 4 BYTE, its value : 0x12345678. Data is 8 BYTE, its value : 0x01020304050607. Check code : 0x5D5D.
  Transmit address is 0x7F+0x12345678+0x01020304050607+0x5D5D.
  After CE becomes low, check RD line to see if it is 0 or not. Transfer address if it is 0, or keep waiting.
  Write in two orders to RF module before transfer data every time. 0x3B/0x35
• After all data transferred, check FLAG is 1 or not
  If 1, transfers the next package after it become low.
  If 0, transfers the next package after it become low later than high.
• Graph of transfer data are as below

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