參數(shù)資料
型號: GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時器參考手冊
文件頁數(shù): 28/90頁
文件大小: 647K
代理商: GPTRM
MOTOROLA
3-6
COMPARE/CAPTURE UNIT
GPT
REFERENCE MANUAL
EDGExA, EDGExB — Input Capture Edge Control Bits
These bits are encoded to configure the input edge sensing logic for the corresponding
input capture.
3.3 Output Compare Functions
Each of the GPT output compare pins OC1, OC2, OC3, OC4, and IC4/OC5 when used
as an output compare function, has a dedicated 16-bit compare register, a 16-bit com-
parator and interrupt generation logic. When the programmed contents of an output
compare register matches TCNT, an output compare status flag (OCxF) bit in TFLG1
is set. Certain automatic actions are initiated for that output compare function. These
automatic actions can be a hardware interrupt request and state changes at the relat-
ed timer output pin.Refer to
7.1.2.1 Timer Interrupt Flag Registers 1–2 (TFLG1/
TFLG2)
for details of the TFLG1 register.
An interrupt is generated on a successful output match, if the interrupt enable bit
(OCxI) for this output compare function is set in TMSK1. Refer to
7.1 Interrupts
for
details on interrupt operation.
The output compare logic is designed to prevent false compares during data transition
times.
Control bits in the CFORC register allow for early forced compares. Refer to
3.3.4 Tim-
er Compare Force Register (CFORC)
.
The operation of OC1 is slightly different from that of the other output compare func-
tions. Refer to
3.3.3 Output Compare 1 (OC1)
for a description of this output function
and its operation.
3.3.1 Timer Control Register 1 (TCTL1)
The automatic actions for OC2–OC4, and IC4/OC5 if configured as an output compare
function, are controlled by pairs of bits, OMx and OLx, in timer control register 1
(TCTL1). Refer to
Figure 3-6
. The automatic pin actions for each output compare are
independently selectable. Refer to
Table 3-2
for the bit combinations of available out-
put actions.
Table 3-1 Edge Bits
EDGExB–A
00
01
10
11
Configuration
Capture Disabled
Capture on Rising Edge Only
Capture on Falling Edge Only
Capture on Any (Rising or Falling) Edge
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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