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HC705RC16GRS/D bảng dữ liệu(PDF) 63 Page - NXP Semiconductors

tên linh kiện HC705RC16GRS/D
Giải thích chi tiết về linh kiện  The MC68HC705RC16 is a low-cost addition to the M68HC05 Family of microcontrollers (MCUs) and is suitable for remote control applications.
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HC705RC16GRS/D bảng dữ liệu(HTML) 63 Page - NXP Semiconductors

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Core Timer
Core Timer Counter Register
MC68HC705RC16 — Rev. 3.0
General Release Specification
Core Timer
8.4 Core Timer Counter Register
The timer counter register is a read-only register that contains the
current value of the 8-bit ripple counter at the beginning of the timer
chain. This counter is clocked by the CPU clock (E/4) and can be used
for various functions, including a software input capture. Extended time
periods can be attained using the TOF function to increment a temporary
RAM storage location, thereby simulating a 16-bit (or more) counter.
The power-on cycle clears the entire counter chain and begins clocking
the counter. After 4064 cycles, the power-on reset circuit is released,
which again clears the counter chain and allows the device to come out
of reset. At this point, if RESET is not asserted, the timer starts counting
up from zero and normal device operation begins. When RESET is
asserted any time during operation (other than POR and low-power
reset), the counter chain is cleared.
Address:
$09
Read:
D7
D6
D5
D4
D3
D2
D1
D0
Write:
Reset:
00000011
= Unimplemented
Figure 8-3. Core Timer Counter Register (CTCR)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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