Embedded Solutions Page 18
IP429II_STATUS1
[$0C 429 Control Register Port read only
CONTROL REGISTER 1
DATA BIT
DESCRIPTION
7
undefined
6
undefined
5
undefined
4
undefined
3
TXR4
2
TXR3
1
TXR2
0
TXR1
FIGURE 7
IP-429 STATUS REGISTER 1 BIT MAP
The TXRx bits are the Transmitter Ready bits driven from the “3282”. When high the
bits indicate that the transmitter is ready to receive data. The rising edge of the signal is
used to create the TX completed interrupt as that edge indicates that the transmitter is
ready to receive more data. When the signal is low it indicates that the transmitter is
ready to send. If the SENDx bit is enabled then the transmission will begin. This bit can
be used for polled operation of the transmitter.