mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 69

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
10.5.6.4 TimerControl register
10.5.6.5 TimerReload register
Selects start and stop conditions for the timer.
Table 112. TimerControl register (address: 2Bh) reset value: 0000 0110b, 06h bit allocation
Table 113. TimerControl register bit descriptions
Defines the preset value for the timer.
Table 114. TimerReload register (address: 2Ch) reset value: 0000 1010b, 0Ah bit allocation
Table 115. TimerReload register bit descriptions
Bit
Symbol
Access
Bit
7 to 4 0000
3
2
1
0
Bit
Symbol
Access
Bit
7 to 0 TReloadValue[7:0]
Symbol
TStopRxEnd
TStopRxBegin
TStartTxEnd
TStartTxBegin
Symbol
7
7
6
0000
R/W
Rev. 3.4 — 26 January 2010
5
Value Description
-
1
0
1
0
1
0
1
0
6
Description
on a start event, the timer loads the TReloadValue[7:0] value.
Changing this register only affects the timer on the next start event. If
TReloadValue[7:0] is set to logic 0 the timer cannot start.
4
056634
these values must not be changed
the timer automatically stops when data reception ends
the timer is not influenced by this condition
the timer automatically stops when the first valid bit is received
the timer is not influenced by this condition
the timer automatically starts when data transmission ends. If
the timer is already running, the timer restarts by loading
TReloadValue[7:0] into the timer.
the timer is not influenced by this condition
the timer automatically starts when the first bit is transmitted. If
the timer is already running, the timer restarts by loading
TReloadValue[7:0] into the timer.
the timer is not influenced by this condition
TStopRxEnd
5
R/W
3
TReloadValue[7:0]
4
TStopRxBegin
R/W
R/W
2
3
TStartTxEnd TStartTxBegin
ISO/IEC 14443 reader IC
2
R/W
1
MFRC531
© NXP B.V. 2010. All rights reserved.
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