参数资料
型号: MC68HC705C9AFB
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: 10 X 10 MM, QFP-44
文件页数: 157/177页
文件大小: 1941K
代理商: MC68HC705C9AFB
Capture/Compare Timer
Advance Information
MC68HC705C9A — Rev. 4.0
80
Capture/Compare Timer
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:
11
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:
11
00
= Unimplemented
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