MFRC522 datasheet(59/96 Pages) NXP

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MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

59 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

Remark: The reload value bits are contained in two 8-bit registers.

9.3.3.12

TCounterValReg register

Contains the timer value.

Remark: The timer value bits are contained in two 8-bit registers.

Table 109. TReloadReg (higher bits) register (address 2Ch); reset value: 00h bit allocation

Bit

Symbol

TReloadVal_Hi[7:0]

Access

R/W

Table 110. TReloadReg register higher bit descriptions

Bit

Symbol

Description

7 to 0

TReloadVal_Hi

[7:0]

deﬁnes the higher 8 bits of the 16-bit timer reload value

on a start event, the timer loads the timer reload value

changing this register affects the timer only at the next start event

Table 111. TReloadReg (lower bits) register (address 2Dh); reset value: 00h bit allocation

Bit

Symbol

TReloadVal_Lo[7:0]

Access

R/W

Table 112. TReloadReg register lower bit descriptions

Bit

Symbol

Description

7 to 0

TReloadVal_Lo

[7:0]

deﬁnes the lower 8 bits of the 16-bit timer reload value

on a start event, the timer loads the timer reload value

changing this register affects the timer only at the next start event

Table 113. TCounterValReg (higher bits) register (address 2Eh); reset value: xxh bit

allocation

Bit

Symbol

TCounterVal_Hi[7:0]

Access

Table 114. TCounterValReg register higher bit descriptions

Bit

Symbol

Description

7 to 0

TCounterVal_Hi

[7:0]

timer value higher 8 bits

Table 115. TCounterValReg (lower bits) register (address 2Fh); reset value: xxh bit

allocation

Bit

Symbol

TCounterVal_Lo[7:0]

Access

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