參數(shù)資料
型號: MC68HC705C9ACFN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Microcontrollers
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 80/160頁
文件大小: 2076K
代理商: MC68HC705C9ACFN
Capture/Compare Timer
Advance Information
MC68HC705C9A — Rev. 4.0
80
Capture/Compare Timer
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
8.4.4 Alternate Timer Registers
The alternate timer registers (ATRH and ATRL), shown in
Figure 8-5
,
contain the current high and low bytes of the 16-bit counter. Reading
ATRH before reading ATRL causes ATRL to be latched until ATRL is
read. Reading ATRL has no effect on the timer overflow flag (TOF).
Writing to the alternate timer registers has no effect.
Figure 8-5. Alternate Timer Registers (ATRH and ATRL)
NOTE:
To prevent interrupts from occurring between readings of ATRH and
ATRL, set the interrupt flag in the condition code register before reading
ATRH, and clear the flag after reading ATRL.
ATRH
$001A
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write:
Reset:
1
1
1
1
1
1
1
1
ATRL
$001B
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
1
1
1
1
1
1
0
0
= Unimplemented
F
Freescale Semiconductor, Inc.
n
.
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