參數(shù)資料
型號(hào): MC68HC05E5DW
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, PDSO28
封裝: SOIC-28
文件頁數(shù): 94/140頁
文件大小: 847K
代理商: MC68HC05E5DW
Timer
Timer Counter Register
MC68HC05E5 Rev. 1.0
General Release Specification
MOTOROLA
Timer
57
NON-DISCLOSURE
AGREEMENT
REQUIRED
8.4 Timer Counter Register
The timer counter register (TCR) is a read-only register which contains
the current value of the 8-bit ripple counter at the beginning of the timer
chain. This counter is clocked at fop divided by four 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 will start
counting up from zero and normal device operation will begin. When
RESET is asserted any time during operation other than POR, the
counter chain will be cleared.
Address:
$0009
Bit 7
654321
Bit 0
Read:
Write:
Reset:
00000011
= Unimplemented
Figure 8-3. Timer Counter Register (TCR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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