CLRC632 Datasheet, PDF (90/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
Example:
CoderRate = 0x05 (~52.97kHz)
For I•CODE1 standard mode the interval should be 8.458ms
->TimeSlotPeriod = CoderRate * interval = 52.97kHz * 8.458ms –1 = 447 (447 = 0x1BF)
Note: The MSB of the TimeSlotPeriod is in the MFOUTSelect register.
Command
Response1
Quit1
Response2
Quit2
TSP1
TSP2
TimeSlotPeriod for TSP1 TimeSlotPeriod for TSP2
I•CODE1 Standard Mode
0xBF
0x1BF
I•CODE1 Fast Mode
0x5F
0x67
Note: It is strictly recommended that bit TxCRCEn is set to 0 before the Quit-Frame is sent. If the TxCRCEn
is not set to 0 a CRC value is calculated and sent with the Quit-Frame.
To calculate the Quit value a CRC8 algorithm has to be used.
9.3 Usage of the Timer Unit
9.3.1 TIME-OUT- AND WATCH-DOG-COUNTER
Having started the timer by setting TReloadValue the timer unit decrements the TimerValue Register
beginning with a certain start event. If a certain stop event occurs e.g. a bit is received from the card, the
timer unit stops (no interrupt is generated).
On the other hand, if no stop event occurs, e.g. the card does not answer in the expected time, the timer unit
decrements down to zero and generates a timer interrupt request. This signals the µ-Processor that the
expected event has not occurred in the given time T_Timer.
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