Motorola MPC8260 User Manual
13-10
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
Table 13-4 describes RTSCR Þelds.
13.3.8 RISC Time-Stamp Register (RTSR)
The RISC time-stamp register (RTSR), shown in Figure 13-5, contains the time stamp.
After reset, setting RTSCR[RTE] causes the time stamp to start counting microseconds
from zero.
from zero.
13.3.9 RISC Microcode Revision Number
The CP writes a revision number stored in its ROM to an dual-port RAM location called
REV_NUM that resides in the miscellaneous parameter RAM. The other locations are
reserved for future use.
REV_NUM that resides in the miscellaneous parameter RAM. The other locations are
reserved for future use.
Table 13-4. RTSCR Field Descriptions
Bits Name
Description
0Ð4
Ñ
Reserved
5
RTE
Time stamp enable.
0 Disable time-stamp timer.
1 Enable time-stamp timer.
0 Disable time-stamp timer.
1 Enable time-stamp timer.
6Ð15
RTPS
Time-stamp timer pre-scale. Must be programmed to generate a 1-µs period input clock to the
time-stamp timer. (Time-stamp frequency = (CPM frequency)/(RTPS+2)
time-stamp timer. (Time-stamp frequency = (CPM frequency)/(RTPS+2)
Bits
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
Time Stamp
Reset
Ñ
R/W
R
Addr
Bits
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Field
Time Stamp
Reset
Ñ
R/W
R
Addr
0X119E2
Figure 13-5. RISC Time-Stamp Register (RTSR)
Table 13-5. RISC Microcode Revision Number
Address
Name
Width
Description
RAM Base + 0x8AF0
REV_NUM
Hword
Microcode revision number
RAM Base + 0x8AF2
Ñ
Hword
Reserved