參數(shù)資料
型號: MFRC52201HN1
廠商: NXP Semiconductors N.V.
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Contactless reader IC
封裝: MFRC52201HN1<SOT617-1 (HVQFN32)|<<http://www.nxp.com/packages/SOT617-1.html<1<Always Pb-free,;MFRC52201HN1<SOT617-1 (HVQFN32)|<<http://www.nxp.com/packages/SOT617-1.html&
文件頁數(shù): 59/92頁
文件大?。?/td> 691K
代理商: MFRC52201HN1
MFRC522_35
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.5 — 21 June 2010
112135
59 of 92
NXP Semiconductors
MFRC522
Contactless reader IC
Table 108. TPrescalerReg register bit descriptions
Bit
Symbol
7 to 0
TPrescaler_Lo[7:0] defines the lower 8 bits of the TPrescaler value
The following formula is used to calculate the timer frequency if the
DemodReg register’s TPrescalEven bit is set to logic 0:
f
timer
= 13.56 MHz / (2*TPreScaler+1).
Where TPreScaler = [TPrescaler_Hi:TPrescaler_Lo] (TPrescaler
value on 12 bits) (Default TPrescalEven bit is logic 0)
The following formula is used to calculate the timer frequency if the
DemodReg register’s TPrescalEven bit inDemoReg is set to logic 1:
f
timer
= 13.56 MHz / (2*TPreScaler+2).
See
Section 8.5 “Timer unit”
.
9.3.3.11
TReloadReg register
Defines the 16-bit timer reload value.
Remark:
The reload value bits are contained in two 8-bit registers.
Table 109. TReloadReg (higher bits) register (address 2Ch); reset value: 00h bit allocation
Bit
7
6
5
4
Symbol
TReloadVal_Hi[7:0]
Access
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
7
6
5
Symbol
TReloadVal_Lo[7:0]
Access
Table 112. TReloadReg register lower bit descriptions
Bit
Symbol
7 to 0 TReloadVal_Lo[7:0]
9.3.3.12
TCounterValReg register
Contains the timer value.
Remark:
The timer value bits are contained in two 8-bit registers.
Description
3
2
1
0
R/W
4
3
2
1
0
R/W
Description
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
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