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): 29/90頁
文件大?。?/td> 647K
代理商: GPTRM
GPT
REFERENCE MANUAL
COMPARE/CAPTURE UNIT
MOTOROLA
3-7
* These bits are part of TCTL2.
NOTE: The address shown is on a word boundary; however, the register can be accessed by a word or byte cycle.
Figure 3-6 Timer Control Register 1 (TCTL1)
OMx — Output Compare Mode Bits
OLx — Output Compare Level Bits
These bits are encoded to specify the output action to be taken as a result of a suc-
cessful OCx compare.
If an output compare function is disconnected from the corresponding pin (OMx:OLx
= 0:0), then a bit in the parallel data direction register (PDDR) determines whether the
pin is configured as an input or output. If OMx:OLx is not 0:0, then the output compare
function overrides the use of the pin for general-purpose input/output. An attempt to
write to the parallel data register (PDR) will not affect the pin. The value is saved in the
PDR and driven out on the pin if the output compare function is later disabled
(OMx:OLx = 0:0) and PDDRx is configured as an output.
3.3.2 Output Compare Registers (TOC1–4) (TI4/O5)
All output compare registers are 16-bit read/write registers which are initialized to
$FFFF by reset. Refer to
Figure 3-7
. If an output compare register is not used for an
output compare function, it can be used as a storage location. A read or write must be
a 16-bit operation to ensure coherency. If coherency is not needed, byte accesses can
be used.
For output compare functions, 16-bit read/write output compare registers TOC1–
TOC4 and TI4/O5 are written to a desired match value and compared against TCNT
to control specified pin actions.
TCTL1 —
Timer Control Register 1
$YFF91E
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OM5
OL5
OM4
OL4
OM3
OL3
OM2
OL2
*
*
*
*
*
*
*
*
RESET:
0
0
0
0
0
0
0
0
Table 3-2 OMx, OLx Bits
OMx–OLx
00
01
10
11
Action Taken on Successful Compare
Timer Disconnected from Output Logic
Toggle OCx Output Line
Clear OCx Output LIne to 0
Set OCx Output Line to 1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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