mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 301
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mcf5307cft90b
Manufacturer Part Number
mcf5307cft90b
Description
Mcf5307 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5307CFT90B.pdf
(484 pages)
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Freescale Semiconductor, Inc.
General-Purpose Timer Programming Model
BCLKO is assumed to be the clock source. TIN cannot simultaneously function as a
clocking source and as an input capture pin.
15
0
Field
CAP (16-bit capture counter value)
Reset
0000_0000_0000_0000
R/W
Read only
Address
MBAR + 0x148 (TCR0); + 0x188 (TCR1)
Figure 13-4. Timer Capture Register (TCR0/TCR1)
13.3.4 Timer Counters (TCN0/TCN1)
The current value of the 16-bit, incrementing timer counters (TCN0/TCN1), Figure 13-5,
can be read anytime without affecting counting. Writing to TCNn clears it. The timer
counter decrements on the clock source rising edge (BCLKO ÷ 1, BCLKO ÷ 16, or TIN).
15
0
Field
16-bit timer counter value count
Reset
0000_0000_0000_0000
R/W
R/W (to reset)
Address
MBAR + 0x14C (TCN0); + 0x18C (TCN1)
Figure 13-5. Timer Counters (TCN0/TCN1)
13.3.5 Timer Event Registers (TER0/TER1)
Each timer event register (TER0/TER1), Figure 13-6, reports capture or reference events
events the timer recognizes by setting TERn[CAP] or TERn[REF], which it does regardless
of the corresponding interrupt-enable bit values, TMRn[ORI,CE].
Writing a 1 to either REF or CAP clears it (writing a 0 does not affect bit value); both bits
can be cleared at the same time. REF and CAP must be cleared early in the exception
handler, before the timer negates the IRQn to the interrupt controller.
7
2
1
0
Field
—
REF
CAP
Reset
0000_0000
R/W
R/W (ones clear/zeros have no effect)
Address
MBAR + 0x151 (TER0); + 0x191 (TER1)
Figure 13-6. Timer Event Registers (TER0/TER1)
Chapter 13. Timer Module
13-5
For More Information On This Product,
Go to: www.freescale.com
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