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參數(shù)資料
| 型號(hào)： | MC68HC05CT4FN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.048 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 103/142頁(yè) |
| 文件大小： | 624K |
| 代理商： | MC68HC05CT4FN |
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16-Bit Timer
Input Capture Register
MC68HC05CT4 — Rev. 2.0
General Release Specification
MOTOROLA
16-Bit Timer
63
NON-DISCLOSURE
AGREEMENT
REQUIRED
8.5 Input Capture Register
Two 8-bit registers, which make up the 16-bit input capture register, are
read-only and are used to latch the value of the free-running counter
after the corresponding input capture edge detector senses a defined
transition. The level transition that triggers the counter transfer is defined
by the corresponding input edge bit (IEDG). Reset does not affect the
contents of the input capture register.
The result obtained by an input capture is one more than the value of the
free-running counter on the rising edge of the internal bus clock
preceding the external transition. This delay is required for internal
synchronization. Resolution is one count of the free-running counter,
which is four internal bus clock cycles.
The free-running counter contents are transferred to the input capture
register on each proper signal transition regardless of whether the input
capture flag (ICF) is set or clear. The input capture register always
contains the free-running counter value that corresponds to the most
recent input capture.
After a read of the input capture register MSB ($14), the counter transfer
is inhibited until the LSB ($15) is also read. This characteristic causes
the time used in the input capture software routine and its interaction
with the main program to determine the minimum pulse period. A read
of the input capture register LSB ($15) does not inhibit the free-running
counter transfer since they occur on opposite edges of the internal bus
clock.
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