MN63Y1208 Datasheet, PDF (117/120 Pages) Panasonic Semiconductor – Built-in 4-Kbit FeRAM non-volatile memory with fast write and low power consumption

9.3 Flow Chart in Tunnel Mode
Figure 9-4 illustrates a flow chart for tunnel mode.
Tunnel mode command reception
Generate IRQ.
Initialize & start the timer.
TUNNEL_MODE1
QUERY command
Command from the
No command from the host
host, except QUERY
No
Timer ≧ QWT setting
Response to QUERY
Response with Busy
Yes
Initialize & start the timer.
TUNNEL_MODE2
Command from the host received
No command from the host
ANSWER command
Stop the timer (holding the timer value).
QUERY command
Command from the host,
except QUERY and ANSWER
Response to ANSWER
Response to QUERY
Response with Busy
Re-start the timer.
Carrier OFF
Response to tunnel mode
Timer ≧ AWT setting
No
Yes
Response with an error to tunnel mode
IDLE state
Regardless of the state after tunnel mode reception, a Carrier OFF
causes the RFID to transition to IDLE state.
Figure 9-4 Flow Chart in Tunnel Mode
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