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MFRC522 数据表(PDF) 30 Page - NXP Semiconductors |
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MFRC522 数据表(HTML) 30 Page - NXP Semiconductors |
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30 / 96 page  MFRC522_33 © NXP B.V. 2009. All rights reserved. Product data sheet PUBLIC Rev. 3 — 26 October 2009 112133 30 of 96 NXP Semiconductors MFRC522 Contactless reader IC The timer can be started manually using the ControlReg register’s TStartNow bit and stopped using the ControlReg register’s TStopNow bit. The timer can also be activated automatically to meet any dedicated protocol requirements, by setting the TModeReg register’s TAuto bit to logic 1. The time delay of a timer stage is calculated with Equation 5 adding 1 to the reload values below: • TPrescaler reload value = 4095 • TReloadVal reload value = 65535 (5) Example: To indicate 100 µs, 678 clock cycles must be counted, so the TPrescaler value must be set to 677 using register TModeReg bits TPrescaler_Hi[3:0] and TPrescalerReg bits TPrescaler_Lo[7:0]. This gives the timer an input clock of 100 µs that enables it to count up to 65535 time slots for each 100 µs. Maximum time 4096 65536 6.78 MHz ------------------------- × 39.59 s == |
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