Motorola MVME2400 Series Manuale di Servizio Pagina 259

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Programming Model
http://www.mcg.mot.com/literature 3-73
3
32-Bit Counter
CTR32
CTR32 is a 32-bit, free-running counter that increments
once per microsecond if the CLK_FREQUENCY register
has been programmed properly. Notice that CTR32
is
cleared by power-up and local reset.
Note When the system clock is a fractional frequency, such as
66.67MHz, CTR32
will count at a fractional amount faster or
slower than 1MHz, depending on the programming of the
CLK_FREQUENCY Register.
External Register Set
EXTERNAL REGISTER SET
The EXTERNAL REGISTER SET is user provided and
is external to the Hawk. It is enabled only when the
tben_en
bit is cleared. When the tben_en bit is set, the
EXTERNAL REGISTER SET
is disabled and the Hawk
does not respond in its range except for the tben register at
$FEF88300.
ADDRESS
$FEF80100
BIT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
NAME
CTR32
OPERATIO
N
READ/WRITE
RESET
0 PL
ADDRESS
$FEF88000 - $FEF8FFF8
BIT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
NAME
EXTERNAL REGISTER SET
OPERATIO
N
READ/WRITE
RESET
X PL
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