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HT46RB50 Datenblatt(PDF) 19 Page - Holtek Semiconductor Inc

Teilenummer HT46RB50
Bauteilbeschribung  28-pin SOP/SKDIP竊?8-pin SSOP
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46RB50 Datenblatt(HTML) 19 Page - Holtek Semiconductor Inc

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HT46RB50
Rev. 1.50
19
2014-07-28
PWM
HT46RB50 有 2 个通道(6+2)/(7+1)位的 PWM 输出(由配置选项决定),与 PD0/PD1 共用引脚。PWM
通道由数据寄存器 PWM0(1AH)和 PWM1(1BH)来控制输出。PWM 计数器的时钟来源为系统时钟(f
SYS)。
PWM 有 2 个 8 位寄存器。PWM 的输出波形如图所示。一旦 PD0/PD1 选择为 PWM 输出,并且 PD0/PD1
为输出模式(PDC.0/PDC.1=“0”),则向 PD0/PD1 寄存器写“1”能够产生 PWM 输出,向 PD0/PD1 寄存
器写“0”会使 PD0/PD1 输出保持为“0”。
fSYS/2
PWM
[PWM] =100
[PWM] =101
PWM
[PWM] =102
PWM
[PWM] =103
PWM
PWM cycle : 256/fSYS
25/64
26/64
26/64
26/64
25/64
25/64
25/64
25/64
25/64
25/64
25/64
26/64
26/64
25/64
25/64
26/64
25/64
26/64
26/64
26/64
Modulation cycle 0
PWM modulation period : 64/fSYS
Modulation cycle 1
Modulation cycle 2
Modulation cycle 3
Modulation cycle 0
(6+2)位模式 PWM
在(6+2)位 PWM 模式中,一个 PWM 周期被分为四个调制周期(调制周期 0~调制周期 3),每个调制
周期有 64 个 PWM 输入时钟。在(6+2)位 PWM 模式中,PWM 寄存器被分为 2 个部分。第一部分是直流
分量,由 PWM.7~PWM.2 控制;第二部分是交流分量,由 PWM.1~PWM.0 控制。
在(6+2)位 PWM 模式中,每个调制周期的占空比见下表:
参数
AC(0~3)
占空比
调制周期 i
(i=0~3)
i<AC
64
1
DC
+
i≥AC
64
DC


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