参数资料
型号: ST92186B3BK
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封装: PLASTIC, SDIP-32
文件页数: 33/148页
文件大小: 1664K
代理商: ST92186B3BK
Obsolete
Product(s)
- Obsolete
Product(s)
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ST92186B - PWM GENERATOR
7.7 PWM GENERATOR
7.7.1 Introduction
The PWM (Pulse Width Modulated) signal genera-
tor allows the digital generation of up to 6
(SDIP42) or 4 (SDIP32) analog outputs when used
with an external filtering network.
The unit is based around an 8-bit counter which is
driven by a programmable 4-bit prescaler, with an
input clock signal equal to the internal clock
INTCLK divided by 2. For example, with a 12 MHz
Internal clock, using the full 8-bit resolution, a fre-
quency range from 1465 Hz up to 23437 Hz can
be achieved.
Higher frequencies, with lower resolution, can be
achieved by using the autoclear register. As an ex-
ample, with a 12 MHz Internal clock, a maximum
PWM repetition rate of 93750 Hz can be reached
with 6-bit resolution.
Figure 63. PWM Block Diagram.
Autoclear
Compare 7
Compare 6
Compare 3
Compare 2
Compare 1
Compare 0
VR01765
PWM7
PWM0
8 Bit Counter
4 Bit Presc.
Control Logic
INTCLK/2
OU
TPUT
LOG
IC
S
T9
Re
giste
rBus
PWM6
PWM3 1)
PWM2 1)
PWM1
Note 1: available on SDIP42 only
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