參數(shù)資料
型號： MC68HCP11A1CP2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝： PLASTIC, DIP-48
文件頁數(shù)： 131/158頁
文件大?。?/td> 3803K
代理商： MC68HCP11A1CP2
PROGRAMMABLE TIMER, RTI, AND PULSE ACCUMULATOR
MC68HC11A8
8-4
TECHNICAL DATA
8
Note that the pulse accumulator function shares line 7 of port A. If the DDRA7 bit in
the pulse accumulator control register (PACTL) is set, then port A line 7 is configured
as an output and OC1 can obtain access by setting OC1M bit 7. In this condition if the
PAEN bit in the PACTL register is set, enabling the pulse accumulator input, then OC1
compares cause a write of OC1D bit 7 to an internal latch, and the output of that latch
drives the pin and the pulse accumulator input. This action can then cause the pulse
accumulator to take the appropriate action (pulse count or gate modes).
8.1.7 Output Compare 1 Data Register (OC1D)
This register is used in conjunction with output compare 1 to specify the data which is
to be stored to the affected bits of port A as the result of a successful OC1 compare.
The bits of the OC1D register correspond bit-for-bit with the lines of port A (lines 7 thru
3 only). When a successful OC1 compare occurs, for each bit that is set in OC1M, the
corresponding data bit in OC1D is stored in the corresponding bit of port A. If there is
a conflicting situation where an OC1 compare and another output compare function
occur during the same E cycle with both attempting to alter the same port A line, the
OC1 action prevails.
8.1.8 Timer Control Register 1 (TCTL1)
OM2, OM3, OM4, and OM5 — Output Mode
OL2, OL3, OL4, and OL5 — Output Level
These two control bits (OMx and OLx) are encoded to specify the output action taken
as a result of a successful OCx compare.
7
6543210
$100D
OC1D7
OC1D6
OC1D5
OC1D4
OC1D3
0
OC1D
RESET
00000000
7
654321
0
$1020
OM2
OL2
OM3
OL3
OM4
OL4
OM5
OL5
TCTL1
RESET
00000000
OMx
OLx
Action Taken Upon Successful Compare
0
Timer disconnected from output pin logic
0
1
Toggle OCx output line
1
0
Clear OCx output line to zero
1
Set OCx output line to one
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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