SLOS743M August 2011 – March 2020 TRF7970A
PRODUCTION DATA.
The RX No Response timer is controlled by the RX NO Response Wait Time Register 0x07. This timer measures the time from the start of slot in the anticollision sequence until the start of tag response. If there is no tag response in the defined time, an interrupt request is sent and a flag is set in IRQ status control register 0x0C. This enables the external controller to be relieved of the task of detecting empty slots. The wait time is stored in the register in increments of 37.76 µs. This register is also preset, automatically, for every new protocol selection. Sending a Reset FIFO (0x0F) direct command after a TX Complete interrupt will disable this feature.
Table 6-34 describes the RX No Response Wait Time register.
Function: Defines the time when "no response" interrupt is sent; only for ISO/IEC 15693 | |||
Default: 0x0E at POR = H or EN = L and at each write to ISO Control register | |||
Bit | Name | Function | Description |
B7 | NoResp7 | No response MSB |
Defines the time when "no response" interrupt is sent. It starts from the end of TX EOF. RX no response wait range is 37.76 µs to 9628 µs (1 to 255), step size is: 37.76 µs. The following default timings are preset by the ISO Control register (0x01): 390 µs → Reserved 529 µs → for all protocols supported, but not listed here 604 µs → Reserved 755 µs → ISO/IEC 15693 high data rate (TI Tag-It HF-I) 1812 µs → ISO/IEC 15693 low data rate (TI Tag-It HF-I) |
B6 | NoResp6 | ||
B5 | NoResp5 | ||
B4 | NoResp4 | ||
B3 | NoResp3 | ||
B2 | NoResp2 | ||
B1 | NoResp1 | ||
B0 | NoResp0 | No response LSB |