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): 30/90頁
文件大?。?/td> 647K
代理商: GPTRM
MOTOROLA
3-8
COMPARE/CAPTURE UNIT
GPT
REFERENCE MANUAL
Figure 3-7 Output Compare Registers (TOC1–4/TI4/O5)
3.3.3 Output Compare 1 (OC1)
Output compare 1 is unique because it can automatically affect any or all of the five
output compare pins (OC1–OC5) as a result of a successful output match. The two
registers that control this capability are the OC1 action mask register (OC1M) and the
OC1 action data register (OC1D). Refer to
Figure 3-8
.
Register OC1M specifies the output pins that are affected as a result of a successful
OC1 compare; register OC1D specifies the data to be transferred to the affected pins.
If an OC1 match and another output match occur at the same time and both attempt
to alter the same pin, the OC1 function controls the state of the pin.
This function allows control of multiple I/O pins automatically with a single output
match. It also allows more than one output compare function to control the state of a
single I/O pin. This allows pulses as short as one timer count to be generated.
Note: The address shown is on a word boundary; however, the register can be accessed by a word or byte cycle.
Figure 3-8 Action Mask and Action Data Registers (OC1M/OC1D)
OC1Mx — OC1 Mask Bits
0 = Corresponding bit in the parallel data port is not affected by OC1 compare.
1 = Corresponding bit in the parallel data port is affected by OC1 compare.
TOC1 —
Output Compare Registers 1
TOC2 —
Output Compare Registers 2
TOC3 —
Output Compare Registers 3
TOC4 —
Output Compare Registers 4
$YFF914
$YFF916
$YFF918
$YFF91A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
TI4/O5 —
Input Capture 4/Output Compare 5 Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
RESET:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
OC1M/OC1D —
OC1 Action Mask Register/OC1 Action Data Register
$YFF908
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OC1M7
OC1M6 OC1M5 OC1M4 OC1M3
0
0
0
OC1D7 OC1D6 OC1D5 OC1D4 OC1D3
0
0
0
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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