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GE VMIVME-2511 PROGRAMMABLE 110 BOARD

From: | Author:Wang | Time :2024-12-18 | 273 visit: | 🔊 Click to read aloud ❚❚ | Share:

GE VMIVME-2511 PROGRAMMABLE 110 BOARD

Each timer can be independently enabled by writing a “1” to the appropriate “Timer x
Enable” field. Similarly, the generation of interrupts by each timer can be
independently enabled by writing a “1” to the appropriate “Timer x IRQ Enable”
field.
If an interrupt is generated by a timer, the source of the interrupt may be determined
by reading the “Timer x Caused IRQ” fields. If the field is set to “1”, then the
respective timer caused the interrupt. Note that multiple timers can cause a single
interrupt. Therefore, the status of all timers must be read to ensure that all interrupt
sources are recognized.
A particular timer interrupt can be cleared by writing a “0” to the appropriate “Timer
x Caused IRQ” field. Alternately, a write to the appropriate Timer x IRQ Clear (TxIC)
register will also clear the interrupt. When clearing the interrupt using the “Timer x
Caused IRQ” fields, note that it is very important to ensure that a proper bit mask is
used so that other register settings are not affected. The preferred method for clearing
interrupts is to use the “Timer x IRQ Clear” registers described on page 52.
Timer Control Status Register 2 (TCSR2)
The timers are also controlled by bits in the Timer Control Status Register 2 (TCSR2)
located at offset 0x04 from the address in BAR2. The mapping of the bits in this
register are as follows:
The “Read Latch Select” bit is used to select the latching mode of the programmable
timers. If this bit is set to “0”, then each timer output is latched upon a read of any one
of its address. For example, a read to the TMRCCR12 register latches the count of
timers 1 and 2. A read to the TMRCCR3 register latches the count of timer 3. This
continues for every read to any one of these registers. As a result, it is not possible to
Clock Rate MSb LSb
2MHz 0 0
1MHz 0 1
500kHz 1 0
250kHz 1 1
Field Bits Read or Write
Read Latch Select TCSR2[0] R/W
Reserved All Other Bits R/W

All of these bits default to “0” after system reset

capture the values of all four timers at a given instance in time. However, by setting

this bit to “1”, all four timer outputs will be latched only on reads to the Timer 1 & 2
Current Count Register (TMRCCR12). Therefore, to capture the current count of all
four timers at the same time, perform a read to the TMRCCR12 first (with a 32-bit
read), followed by a read to TMRCCR3 and TMRCCR4. The first read (to the
TMRCCR12 register) causes all four timer values to be latched at the same time. The
subsequent reads to the TMRCCR3 and TMRCCR4 registers do not latch new count
values, allowing the count of all timers at the same instance in time to be obtained.
Timer 1 & 2 Load Count Register (TMRLCR12)
Timers 1 & 2 are 16-bits wide and obtain their load count from the Timer 1 & 2 Load
Count Register (TMRLCR12), located at offset 0x10 from the address in BAR2. The
mapping of bits in this register are as follows:
When either of these fields are written (either by a single 32-bit write or separate
16-bit writes), the respective timer is loaded with the written value on the next rising
edge of the timer clock, regardless of whether the timer is enabled or disabled. The
value stored in this register is also automatically reloaded on terminal count (or
timeout) of the timer.
Timer 3 Load Count Register (TMRLCR3)
Timer 3 is 32-bits wide and obtains its load count from the Timer 3 Load Count
Register (TMRLCR3), located at offset 0x14 from the address in BAR2. The mapping
of bits in this register are as follows:
When this field is written, Timer 3 is loaded with the written value on the next rising
edge of the timer clock, regardless of whether the timer is enabled or disabled. The
value stored in this register is also automatically reloaded on terminal count (or
timeout) of the timer.
Field Bits Read or Write
Timer 2 Load Count TMRLCR12[31..16] R/W
Timer 1 Load Count TMRLCR12[15..0] R/W
Field Bits Read or Write
Timer 3 Load Count TMRLCR3[31..0] R/W
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