XR20V2172 Datasheet, PDF (44/51 Pages) Exar Corporation – TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER

XR20V2172
PRELIMINARY
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
REV. P1.0.1
FIGURE 19. MODEM INPUT PIN INTERRUPT
SDA
SLAVE
ADDRESS
W A MSR REGISTER A S
SLAVE
ADDRESS
RA
DATA
A
IRQ#
TD2
TD3
MODEM pin
FIGURE 20. GPIO PIN INTERRUPT
ACK from slave
ACK from slave
ACK from master
SDA
SLAVE
ADDRESS
W A IOSTATE REG. A S
SLAVE
ADDRESS
RA
DATA
AP
IRQ#
TD4
TD5
GPIOn
44