pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 126

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

•
Figure 50
2.6.7
All interrupt sources from the ISTAH register are combined (ORed) to a single HDLC
controller interrupt signal hint. Each of the interrupt sources can individually be masked
in the MASKH register. A masked interrupt is not indicated in the ISTAH register but
remains internally stored and pending until the interrupt is unmasked and read by the
host.
The individual interrupt sources of the HDLC controller during reception and
transmission of data are explained in
The HDLC controller interrupts XDU and XMR have a special impact on the internal
functions. E.g. the transmitter of the HDLC controller is locked if a data underrun
condition occurs and the ISTAH.XDU is not read (the interrupt can only be read if
unmasked), same applies for XMR.
Data Sheet
TIMR1
7 6 5 4 3 2 1 0
CNT
HDLC Controller Interrupts
Timer Register
VALUE
Retry Counter
0 ... 6 : Count Down Timer
Expiration Period
T1 = (VALUE + 1) x 0.064 sec
24
H
7 : Periodic Timer
Chapter 2.6.2.1
112
or
Chapter 2.6.3.1
T = CNT x 2.048 sec + T1
T = T1
Functional Description
PEF 81902
respectively.
2001-11-12
21150_14