参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 20/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
ANALOG SUBSYSTEM
MC68HC05SB7
15-18
REV 2.1
CPF
This read-only ag bit is set when the voltage on the positive input of compara-
tor rises above the voltage on its negative input. This bit is reset by writing a
logical one to the CPFR reset bit in the ASR. This bit is cleared by a reset of the
device.
1 =
The voltage on positive input of comparator was above the voltage
on its negative input since CPF had been cleared.
0 =
The voltage on positive input of comparator has not been above the
voltage on its negative input since CPF had been cleared.
CPFR
Writing a logical one to this write-only ag clears the CPF ag in the ASR. Writ-
ing a logical zero to this bit has no effect. Reading the CPFR bit will return a
logical zero. By default this bit looks cleared following a reset of the device.
1 =
Clears the CPF ag bit.
0 =
No effect.
NOTE
The CPFR bit should be written with a logical one following a power up of the
comparator. This will clear out any latched CPF ag bit which might have been set
during the slower power up sequence of the analog circuitry.
If both inputs to the comparator are above the maximum common-mode input
voltage (VDD–1.5V) the output of the comparator is indeterminate and may set the
comparator ag. Applying a reset to the device may only temporarily clear this ag
as long as both inputs of a comparator remain above the maximum common-
mode input voltages.
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