參數(shù)資料
型號(hào): MC68HC705X32FU
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁(yè)數(shù): 230/232頁(yè)
文件大小: 5792K
代理商: MC68HC705X32FU
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MC68HC05X16
6-9
PROGRAMMABLE TIMER
6
6.4
Output compare
‘Output compare’ is a technique which may be used, for example, to generate an output waveform,
or to signal when a specic time period has elapsed, by presetting the output compare register to
the appropriate value.
There are two output compare registers: output compare register 1 (OCR1) and output compare
register 2 (OCR2).
Note:
The same output compare interrupt enable bit (OCIE) is used for the two output
compares.
6.4.1
Output compare register 1 (OCR1)
The 16-bit output compare register 1 is made up of two 8-bit registers at locations $16 (MSB) and
$17 (LSB). The contents of the output compare register 1 are compared with the contents of the
free-running counter continually and, if a match is found, the corresponding output compare ag
(OCF1) in the timer status register is set and the output level (OLVL1) is transferred to pin TCMP1.
The output compare register 1 values and the output level bit should be changed after each
successful comparison to establish a new elapsed timeout. An interrupt can also accompany a
successful output compare provided the corresponding interrupt enable bit (OCIE) is set. (The
free-running counter is updated every four internal bus clock cycles.)
After a processor write cycle to the output compare register 1 containing the MSB ($16), the output
compare function is inhibited until the LSB ($17) is also written. The user must write both bytes
(locations) if the MSB is written rst. A write made only to the LSB ($17) will not inhibit the compare
1 function. The processor can write to either byte of the output compare register 1 without affecting
the other byte. The output level (OLVL1) bit is clocked to the output level register and hence to the
TCMP1 pin whether the output compare ag 1 (OCF1) is set or clear. The minimum time required
to update the output compare register 1 is a function of the program rather than the internal
hardware. Because the output compare ag 1 and the output compare register 1 are not dened
at power on, and not affected by reset, care must be taken when initializing output compare
functions with software. The following procedure is recommended:
Write to output compare high 1 to inhibit further compares;
Read the timer status register to clear OCF1 (if set);
Write to output compare low 1 to enable the output compare 1 function.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Output compare high 1
$0016
Undened
Output compare low 1
$0017
Undened
95
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MC68HC05X16CFU 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP64
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