PSF21150 INFINEON [Infineon Technologies AG], PSF21150 Datasheet - Page 231

• Manufacturer Part Number: PSF21150
• Description: IPAC-X ISDN PC ADAPTER CIRCUIT
• Manufacturer: INFINEON [Infineon Technologies AG]

PSB 21150
PSF 21150
Detailed Register Description
• after a device reset
XDU ... Transmit Data Underrun
The current transmission of a frame is aborted by transmitting seven ’1’s because the
XFIFOB holds no further data. This interrupt occurs whenever the microcontroller has
failed to respond to an XPR interrupt (ISTAB register) quickly enough, after having
initiated a transmission and the message to be transmitted is not yet complete.
4.6.2
MASKB - Mask Register B-Channels
Value after reset: FF
H
7
0
MASKB
RME
RPF
RFO
XPR
1
XDU
1
1
WR (70/80)
Each interrupt source in the ISTAB register can selectively be masked by setting the
corresponding bit in MASKB to ’1’. Masked interrupt status bits are not indicated when
ISTAB is read. Instead, they remain internally stored and pending until the mask bit is
reset to ’0’.
For general information please refer to
Chapter
3.9.6.
Data Sheet
231
2000-07-21