参数资料
型号: ADUC7121BBCZ-RL
厂商: Analog Devices Inc
文件页数: 44/96页
文件大小: 0K
描述: PRECISION ANALOG MCU I.C
标准包装: 1
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 41.78MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 126KB(63K x 16)
程序存储器类型: 闪存
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 9x12b,D/A 4x12b
振荡器型: 内部
工作温度: -10°C ~ 95°C
封装/外壳: 108-LFBGA,CSPBGA
包装: 标准包装
其它名称: ADUC7121BBCZ-RLDKR
ADuC7121
Rev. B | Page 49 of 96
DIGITAL PERIPHERALS
PWM GENERAL OVERVIEW
The ADuC7121 integrates a 6-channel PWM interface. The PWM
outputs can be configured to drive an H-bridge or can be used as
standard PWM outputs. On power-up, the PWM outputs default
to H-bridge mode. This ensures that the motor is turned off by
default. In standard PWM mode, the outputs are arranged as three
pairs of PWM pins. Users have control over the period of each
pair of outputs and over the duty cycle of each individual output.
In all modes, the PWMxCOMx MMRs control the point at which
the PWM outputs change state. An example of the first pair of
PWM outputs (PWM1 and PWM2) is shown in Figure 34.
Figure 34. PWM Timing
The PWM clock is selectable via PWMCON1 with one of the
following values: UCLK divide-by-2, 4, 8, 16, 32, 64, 128, or
256. The length of a PWM period is defined by PWMxLEN.
The PWM waveforms are set by the count value of the 16-bit
timer and the compare registers contents as shown with the
PWM1 and PWM2 waveforms above.
The low-side waveform, PWM2, goes high when the timer
count reaches PWM1LEN, and it goes low when the timer
count reaches the value held in PWM1COM3 or when the
high-side waveform PWM1 goes low.
The high-side waveform, PWM1, goes high when the timer
count reaches the value held in PWM1COM1, and it goes low
when the timer count reaches the value held in PWM1COM2.
Table 70. PWM MMRs
Name
Function
PWMCON1
PWM control
PWM1COM1
Compare Register 1 for PWM Output 1 and PWM Output 2
PWM1COM2
Compare Register 2 for PWM Output 1 and PWM Output 2
PWM1COM3
Compare Register 3 for PWM Output 1 and PWM Output 2
PWM1LEN
Frequency control for PWM Output 1 and PWM Output 2
PWM2COM1
Compare Register 1 for PWM Output 3 and PWM Output 4
PWM2COM2
Compare Register 2 for PWM Output 3 and PWM Output 4
PWM2COM3
Compare Register 3 for PWM Output 3 and PWM Output 4
PWM2LEN
Frequency control for PWM Output 3 and PWM Output 4
PWM3COM1
Compare Register 1 for PWM Output 5 and PWM Output 6
PWM3COM2
Compare Register 2 for PWM Output 5 and PWM Output 6
PWM3COM3
Compare Register 3 for PWM Output 5 and PWM Output 6
PWM3LEN
Frequency control for PWM Output 5 and PWM Output 6
PWMCON2
PWM convert start control
PWMICLR
PWM interrupt clear
HIGH SIDE
(PWM1)
LOW SIDE
(PWM2)
PWM1COM3
PWM1COM2
PWM1COM1
PWM1LEN
0
94
92
-0
33
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