ATA5823 ATMEL Corporation, ATA5823 Datasheet - Page 70

• Manufacturer Part Number: ATA5823
• Description: Uhf Ask/fsk Transceiver Ata5823 Ata5824
• Manufacturer: ATMEL Corporation

14.4
70
Interrupts
ATA5823/ATA5824
Via pin IRQ, the transceiver signals different operating conditions to a connected microcontrol-
ler. If a specific operating condition occurs, pin IRQ is set to a high level.
If an interrupt occurs, it is recommended to delete the interrupt immediately by reading the sta-
tus register, thus the next possible interrupt doesn’t get lost. If the Interrupt pin doesn’t switch to
a low level by reading the status register, the interrupt was triggered by the RX/TX data buffer. In
this case, read or write the RX/TX data buffer according to
Table 14-8.
Events in Status Register
State transition of status bit N_Power_On
(0
Appearance of status bit Power_On
(0
Events During TX Operation (T_MODE = 0)
1, 2, 4 or 12 bytes are in the TX data buffer or
the TX data buffer is empty (depends on IR0
and IR1 in control register 1)
Events During RX Operation (T_MODE = 0)
1, 2, 4 or 12 received bytes are in the RX data
buffer or a receiving error is occurred (depends
on IR0 and IR1 in control register 1)
Successful Bit-check (P_MODE = 0)
Events During FD Operation
TX data buffer empty
Note:
Operating Conditions Which Sets Pin IRQ
1; 1
1)
1. During reading of the RX/TX buffer, no IRQ is issued, due to the received bytes or a receiv-
ing error.
0)
Interrupt Handling
to High Level
Read status register or
Command delete IRQ
Write TX data buffer or
Write control register 1 or
Write control register 4 or
Write control register 5 or
Write control register 6 or
Write control register 7 or
Command delete IRQ
Read RX data buffer
Write control register 1 or
Write control register 4 or
Write control register 5 or
Write control register 6 or
Write control register 7 or
Command delete IRQ
Read RX data buffer
Write control register 1 or
Write control register 4 or
Write control register 5 or
Write control register 6 or
Write control register 7 or
Command delete IRQ
Operations Which Sets Pin IRQ to Low Level
Table
(1)
(1)
14-8.
or
or
4829D–RKE–06/06