MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 424
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MPC8544COMEDEV
Manufacturer Part Number
MPC8544COMEDEV
Description
KIT DEV EXPRESS MPC8544COM
Manufacturer
Freescale Semiconductor
Type
MPUr
Datasheets
1.MPC8544VTALF.pdf
(117 pages)
2.MPC8544VTALF.pdf
(2 pages)
3.MPC8544VTALF.pdf
(1340 pages)
Specifications of MPC8544COMEDEV
Contents
Board
For Use With/related Products
MPC8544
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 424 of 1340
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Programmable Interrupt Controller
10.3.2.5
The global timer destination register controls the destination processor for this timer’s interrupt, as shown
in
Table 10-19
10.3.2.6
The timer control register (TCR) shown in
count frequency and roll-over behavior.
There are two choices for the clock source for the timers: a selectable frequency ratio from the CCB clock,
or the RTC signal. The TCR also provides the ability to create timers larger than the default 31-bit global
timers. Timer cascade fields allow configuration of up to two 63-bit timers, one 95-bit timer or one 127-bit
timer.
With one exception mentioned below, the value reloaded into a timer is determined by its roll-over control
field TCR[ROVR]. Setting a timer’s roll-over field causes its current count register to roll over to all ones
when the count reaches zero. This is equivalent to reloading the count register with 0xFFFF_FFFF instead
of its base count value. Clearing a timer’s associated ROVR bit ensures the timer always reloads with its
base count value.
When timers are cascaded the last (most significant) counter in the cascade also affects their roll-over
behavior. Cascaded timers always reload their base count when the most significant counter has
decremented to zero, regardless of the settings in TCR[ROVR].
For example, timers 0, 1, and 2 can be cascaded to generate one interrupt every hour. As shown in
Table
clock, (TCR[CLKR] = 0 sets a clock ratio of 8), provides a basic input of 41.625 MHz to timer 0. Setting
timer 0 to count 41,625,000 (0x27B_25A8) timer clock cycles will generate one output per second. Setting
both timers 1 and 2 to 59, and cascading all three timers, generates one interrupt every hour from timer 2.
10-26
0–30
Bits Name
Offset 0x4_1130, 0x4_1170, 0x4_11B0, 0x4_11F0
Reset 0
31
Figure
W
R
10-20, given a CCB clock of 333 MHz, letting the timer clock frequency default to 1/8
P0
—
0
10-15.
0
Reserved
Processor 0. Indicates that processor 0 handles any interrupt. This bit is meaningful only in a multi-core device. In
a single-core device, internally serviced interrupts are always directed to processor 0. Permanently set and read
only.
1 Interrupt directed to processor 0.
describes the GTDRn fields.
0
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Global Timer Destination Registers (GTDR n )
Timer Control Register (TCR)
0
0
0
Figure 10-15. Global Timer Destination Registers (GTDR n )
0
0
0
Table 10-19. GTDR n Field Descriptions
0
0
0
Figure 10-17
0
0
0
—
0
Description
0
provides various configuration options such as
0
0
0
0
0
0
0
0
0
Freescale Semiconductor
0
Access: Read only
0
th
0
the system
0
30 31
0
P0
1
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