MN63Y1208 Datasheet, PDF (82/120 Pages) Panasonic Semiconductor – Built-in 4-Kbit FeRAM non-volatile memory with fast write and low power consumption

Chapter 5 Serial Communication Mode
5.2.5.5 STATUS
„ Purpose
Reads an RFID status information from the host.
„ Command message
The STATUS command has no command message.
A slave transmission request serves as a STATUS command.
„ Response message
z Format
Status
1 byte
z Data field
Field
Status
Output value
See 5.2.4 Status.
Remarks
5.2.6 Time Chart
Figure 5-3 shows the time chart when I2C is used.
t0: The host inputs a start condition and then inputs a slave address and R/W bit (L). The RFID returns an
ACK if the slave address is identified. Subsequently, if the host inputs a command data, the RFID returns an
ACK in byte units. The host inputs a stop condition last. Pull up the NIRQ pin to high.
t1: The host stops the clock input to the SCK pin after inputting command data. The RFID executes command
processing internally.
t2: Once the internal command processing is completed, the RFID outputs low to the NIRQ pin to send a
response.
t3: The host detects the low output of the NIRQ pin and inputs a start condition, and then inputs a slave
address and R/W bit (H). The RFID returns an ACK and stops the low output of the NIRQ pin if the slave
address is identified. Subsequently, if the host inputs a clock to the SCK pin, the RFID returns an ACK in byte
units. The host inputs an ACK in byte units, and inputs an NACK and stop condition last.
t0
t1
t2
t3
NIRQ
SCL
IRQ generated by
RFID
(Command processing terminated)
SDA
Address
command
Address
Response
Figure 5-3 Time Chart
82