Motorola MVME5100 用户手册
Programming Model
http://www.motorola.com/computer/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.
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
66.67 MHz, CTR32 will count at a fractional amount faster or
slower than 1 MHz, depending on the programming of the
CLK_FREQUENCY Register.
66.67 MHz, CTR32 will count at a fractional amount faster or
slower than 1 MHz, 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.
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.
The tben register (which is internal to Hawk) responds
only when tben_en is set.
only when tben_en is set.
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
Operation
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
Operation
READ/WRITE
Reset
X PL