mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 591

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

16.7.5.6 SERIAL INTERFACE RAM POINTER REGISTER. The 32-bit, read-only serial
interface RAM pointer (SIRP) register indicates the RAM entry that is currently being
serviced. It contains the real-time status location of the serial interface that is currently inside
the TDM frame. Although you may not need to access the SIRP register, it does provide
information that might be helpful for debugging and for synchronizing system activity with
TDM activity. Usually, reading the SISTR is sufficient for most applications.
You can determine which RAM entry in the serial interface RAM is currently in progress, but
you cannot determine the status within that entry. For example, if the RAM entry is
programmed to select four contiguous time-slots from the TDM and the SIRP register
indicates the entry is currently active, you will not know which of the four time-slots is
currently in progress. The SIRP register does, however, change its status as soon as the
next serial interface RAM entry begins processing.
The value of this register changes on serial clock transitions. Before acting on the
information found in this register, you must perform two reads and verify that they returned
the same value. The pointers provided by this register indicate the serial interface RAM entry
word offset that is currently in progress.
SIRP
RESET
RESET
FIELD
ADDR
FIELD
ADDR
R/W
R/W
BIT
BIT
16
0
RESERVED
RESERVED
0
R
0
R
Note: You can externally connect one of the eight strobes to an interrupt pin to
17
1
VT2
VR2
18
generate an interrupt on a particular serial interface RAM entry.
2
R
R
0
0
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For More Information On This Product,
19
3
20
MPC823 REFERENCE MANUAL
4
Go to: www.freescale.com
RAPTR2
TAPTR2
21
5
R
R
0
0
22
6
(IMMR & 0xFFFF0000) + 0xAF0
(IMMR & 0xFFFF0000) + 0xAF2
23
7
24
8
RESERVED
RESERVED
R
R
0
0
25
9
Communication Processor Module
VR1
VT1
10
26
0
R
0
R
11
27
12
28
RAPTR1
TAPTR1
13
29
R
R
0
0
14
30
16-139
15
31