參數(shù)資料
型號: MC68HC05P18ACP
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 100/130頁
文件大?。?/td> 1310K
代理商: MC68HC05P18ACP
16-Bit Timer
Input Capture
MC68HC05P18A
Technical Data
16-Bit Timer
NON-DISCLOSURE
AGREEMENT
REQUIRED
After a read of the MSB of the input capture register pair (ICRH), counter
transfers are inhibited until the LSB of the register pair (ICRL) is also
read. This characteristic forces the minimum pulse period attainable to
be determined by the time required to execute an input capture software
routine in an application.
Reading the LSB of the input capture register pair (ICRL) does not inhibit
transfer of the free-running counter. Again, minimum pulse periods are
ones which allow software to read the LSB of the register pair (ICRL) and
perform needed operations. There is no conflict between reading the
LSB (ICRL) and the free-running counter transfer since they occur on
opposite edges of the PH2 clock.
Figure 8-9. State Timing Diagram for Input Capture
INPUT CAPTURE
FLAG
INPUT CAPTURE
REGISTER
16-BIT FREE-RUNNING
COUNTER
TCAP PIN
INPUT CAPTURE
LATCH
PH2 CLOCK
Note: If the input edge occurs in the shaded area from one T10 timer state to the other T10 timer state, the input capture
ag is set during the next T11 timer state.
$FFEC
$FFED
$FFEE
$FFEF
$FFEB
$FFED
(SEE NOTE)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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