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HT46R64 데이터시트(PDF) 19 Page - Holtek Semiconductor Inc

부품명 HT46R64
상세설명  52/100-pin LQFP
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제조업체  HOLTEK [Holtek Semiconductor Inc]
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HT46R64 데이터시트(HTML) 19 Page - Holtek Semiconductor Inc

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HT46R64/HT46C64
Rev. 2..10
19
2014-06-06
无论是定时模式还是外部事件计数模式,一旦开始计数,定时/计数器 0/1 会从寄存器当前值向上计到
0FFH(0FFFFH)。一旦发生溢出,定时/计数器 0/1 会从预置寄存器中重新加载初值,并开始计数;同时置
位中断请求标志(T0F,INTC0 的第 6 位;T1F,INTC1 的第 4 位)。
在脉宽测量模式,当 T0ON/T1ON 与 T0E/T1E 是 1 时,只要 TMR0/TMR1 引脚有一个上升沿信号(如
果 T0E/T1E 是 0,则为下降沿信号),定时/计数器就会开始计数,直到 TMR0/TMR1 脚电平恢复,同时
T0ON/T1ON 被清零。测量的结果会保存在寄存器中,直到有新的测量开始。换句话说,一次只能测量一
个脉冲宽度。重新置位 T0ON/T1ON 后,可以继续测量。注意,在该模式下,定时/计数器是跳变触发而不
是电平触发。当计数器溢出时,定时/计数器会从预置寄存器中重新加载初值,并置位中断请求标志,这与
其它两种模式一样。
符号
功能
0
1
2
T0PSC0
T0PSC1
T0PSC2
定义预分频器级数,T0PSC2,T0PSC1,T0PSC0=
000:fINT=fSYS
001:fINT=fSYS/2
010:fINT=fSYS/4
011:fINT=fSYS/8
100:fINT=fSYS/16
101:fINT=fSYS/32
110:fINT=fSYS/64
111:fINT=fSYS/128
3
T0E
定义定时/计数器 TMR0 的触发方式
在事件计数模式(T0M1,T0M0)=(0,1):
1:在下降沿计数
0:在上升沿计数
在脉冲宽度测量模式(T0M1,T0M0)=(1,1):
1:在上升沿开始计数,下降沿停止计数
0:在下降沿开始计数,上升沿停止计数
4
T0ON
打开/关闭定时/计数器(0=关闭,1=打开)
5
未用,读出为“0”
6
7
T0M0
T0M1
定义工作模式(T0M1,T0M0):
01=事件计数模式(外部时钟)
10=定时模式(内部时钟)
11=脉冲宽度测量模式
00 =未用
TMR0C(0EH)寄存器


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