Product data

MFRC631 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 4 February 2014
227433 78 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
9.7.2.18 T3CounterValHi
High byte of the current counter value the 16-bit Timer3.
9.7.2.19 T3CounterValLo
Low byte of the current counter value the 16-bit Timer3.
9.7.2.20 T4Control
The wake-up timer T4 activates the system after a given time. If enabled, it can start the
low power card detection function.
Table 106. T3ReloadLo bits
Bit Symbol Description
7 to 0 T3ReloadLo Defines the low byte of the reload value of Timer3. With the start event
the timer load the value of the T3ReloadValHi and T3RelaodValLo.
Changing this register affects the timer only at the next start event.
Table 107. T3CounterValHi register (address 21h)
Bit 7 6 5 4 3 2 1 0
Symbol T3CounterValHi
Access
rights
dy
Table 108. T3CounterValHi bits
Bit Symbol Description
7 to 0 T3Counter
ValHi
High byte of the current counter value of Timer3.
This value shall not be read out during reception.
Table 109. T3CounterValLo register (address 22h)
Bit 7 6 5 4 3 2 1 0
Symbol T3CounterValLo
Access
rights
dy
Table 110. T3CounterValLo bits
Bit Symbol Description
7 to 0 T3Counter
ValLo
Low byte current counter value of Timer3.
This value shall not be read out during reception.
Table 111. T4Control register (address 23h)
Bit 7 6 5 4 3 2 1 0
Symbol T4Running T4Start
StopNow
T4Auto
Trimm
T4Auto
LPCD
T4Auto
Restart
T4AutoWakeUp T4Clk
Access
rights
dy w r/w r/w r/w r/w r/w