参数资料
型号: W78E858A40FL
厂商: Nuvoton Technology Corporation of America
文件页数: 7/35页
文件大小: 0K
描述: IC MCU 8-BIT 32K FLASH 44-PQFP
标准包装: 96
系列: W78
核心处理器: 8052
芯体尺寸: 8-位
速度: 40MHz
连通性: EBI/EMI,串行端口
外围设备: POR,PWM,WDT
输入/输出数: 36
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 44-BQFP
包装: 托盘
W78E858
5.11 Pulse Width Modulator System
The pulse width modulator system of W78E858 contains four PWM output channels with a common 8-
bit counter. These channels generate pulses of programmable length and interval. The prescaler and
counter are common to four PWM channels.
5.11.1 PWMCON (91H)
BIT
NAME
FUNCTION
7
4
-
Reverse
3
PWM3
Enable P1.7 as PWM clock output.
2
PWM2
Enable P1.6 as PWM clock output.
1
PWM1
Enable P1.5 as PWM clock output.
0
PWM0
Enable P1.4 as PWM clock output.
5.11.2 PWMP (92H)
The prescaler is loaded with the complement of the PWMP register during counter overflow. The
repetition frequency is defined by 8-bit prescaler which clocks the counter. The prescaler division
factor = (PWMP + 1). Reading the PWMP gives the current reload value. The actual count of the
prescaler can’t be read.
The PWM counter is enabled with any bit PWMENn (n = 0, 1, 2, 3) of the PWMCON register. Output to
the port pin is separately enabled by setting the PWMENn bits in the PWMCON register. The PWM
function is reset by a chip reset. In idle mode, the PWM will function as configurated in PWMCON. In
power-down state of the PWM will freeze when the internal clock stops. If the chip is awakened with
an external interrupt, the PWM will continue to function its state when power-down was entered.
The repetition frequency is given by:
Fpwm =
Fosc
[255 x (1+PWMP)]
An oscillator frequency of 24 MHz results in a repetition range of 367.65 Hz to 94.12 KHz. The
high/low ratio of PWMn is DACn/(255-DACn) for DACn values except 255. A DACn value 255 results
in a high PWMn output.
Publication Release Date: April 22, 2008
- 15 -
Revision A8
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