CLRC632 Datasheet, PDF (26/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Multiple Protocol Contactless Reader IC
Product Specification Rev. 3.0; May 2003
CL RC632
5.2.1.4 PrimaryStatus Register
Status flags of the receiver, transmitter and the FIFO buffer.
Name: PrimaryStatus
Address: 0x03
7
0
Access
r
Rights
6
5
4
ModemState
r
r
r
Reset value: 00000101, 0x05
3
2
1
0
IRq
Err
HiAlert LoAlert
r
r
r
r
Description of the bits
Bit
Symbol
7
0
6-4 ModemState
3
IRQ
2
Err
1
HiAlert
0
LoAlert
Function
Reserved for future use.
ModemState shows the state of the transmitter and receiver state machines.
State Name of State
Description
000 Idle
Neither the transmitter nor the receiver is in operation,
since none of them is started or
since none of them has input data.
001 TxSOF
Transmitting the ‘Start Of Frame’ Pattern.
010 TxData
Transmitting data from the FIFO buffer (or redundancy
check bits).
011 TxEOF
Transmitting the ‘End Of Frame’ Pattern.
100 GoToRx1
Intermediate state, when receiver starts.
GoToRx2
Intermediate state, when receiver finishes.
101 PrepareRx
Waiting until the time period selected in the RxWait
Register is expired.
110 AwaitingRx
Receiver activated; Awaiting an input signal at pin Rx.
111 Receiving
Receiving data.
This bit shows, if any interrupt source requests attention (with respect to the
setting of the interrupt enable flags in the InterruptEn Register).
This bit is set to 1, if any error flag in the ErrorFlag Register is set.
Is set to 1, when the number of bytes stored in the FIFO buffer fulfil the following
equation: HiAlert = (64 − FIFOLength) ≤ WaterLevel
Example:
FIFOLength=60, WaterLevel=4 ⇒ HiAlert =1
FIFOLength=59, WaterLevel=4 ⇒ HiAlert =0
Is set to 1, when the number of bytes stored in the FIFO buffer fulfil the following
equation: LoAlert = FIFOLength ≤ WaterLevel
Example:
FIFOLength=4, WaterLevel=4
FIFOLength=5, WaterLevel=4
⇒ LoAlert =1
⇒ LoAlert =0
26
Confidential