參數(shù)資料
型號： uPSD3234BV-40U1T
廠商： 意法半導體
英文描述： Flash Programmable System Devices with 8032 Microcontroller Core
中文描述： 閃存可編程系統(tǒng)設備與8032微控制器內(nèi)核
文件頁數(shù)： 67/170頁
文件大?。?/td> 2717K
代理商： UPSD3234BV-40U1T
67/170
uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
PULSE WIDTH MODULATION (PWM)
The PWM block has the following features:
Four-channel, 8-bit PWM unit with 16-bit
prescaler
One-channel, 8-bit unit with programmable
frequency and pulse width
PWM Output with programmable polarity
4-channel PWM Unit (PWM 0-3)
The 8-bit counter of a PWM counts module 256
(i.e., from 0 to 255, inclusive). The value held in
the 8-bit counter is compared to the contents of the
Special Function Register (PWM 0-3) of the corre-
sponding PWM. The polarity of the PWM outputs
is programmable and selected by the PWML Bit in
PWMCON register. Provided the contents of a
PWM 0-3 register is greater than the counter val-
ue, the corresponding PWM output is set HIGH
(with PWML = 0). When the contents of this regis-
ter is less than or equal to the counter value, the
corresponding PWM output is set LOW (with
PWML = 0). The pulse-width-ratio is therefore de-
■
■
■
fined by the contents of the corresponding Special
Function Register (PWM 0-3) of a PWM. By load-
ing the corresponding Special Function Register
(PWM 0-3) with either 00H or FFH, the PWM out-
put can be retained at a constant HIGH or LOW
level respectively (with PWML = 0).
For each PWM unit, there is a 16-bit Prescaler that
are used to divide the main system clock to form
the input clock for the corresponding PWM unit.
This prescaler is used to define the desired repeti-
tion rate for the PWM unit. SFR registers B1h -
B2h are used to hold the 16-bit divisor values.
The repetition frequency of the PWM output is giv-
en by:
fPWM
8
= (f
OSC
/ prescaler0) / (2 x 256)
And the input clock frequency to the PWM
counters is = f
OSC
/ 2 / (prescaler data value + 1)
See
I/O PORTS (MCU MODULE), page 42
for
more information on how to configure the Port 4
pin as PWM output.
Figure 36. Four-Channel 8-bit PWM Block Diagram
AI06647
8-bit PWM0-PWM3
Comparators Registers
8-bit PWM0-PWM3
Comparators
8
8
8-bit Counter
x 4
8-bit PWM0-PWM3
Data Registers
8
x 4
Port4.3
Port4.4
Port4.5
Port4.6
Overflow
clock
load
16-bit Prescaler
Register
(B2h,B1h)
1
16-bit Prescaler
Counter
f
OSC
/2
CPU rd/wr
CPU rd/wr
load
PWMCON bit5 (PWME)
PWMCON bit7 (PWML)
4
8
DATA BUS
x 4
8
8
相關PDF資料
PDF描述
uPSD3234BV-40U6T Flash Programmable System Devices with 8032 Microcontroller Core
uPSD3234 Flash Programmable System Device with 8032 Microcontroller Core(嵌入高速“8032微控制器核”的Flash型可編程系統(tǒng)器)
uPSD3251(中文) Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設備)
uPSD3251 Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設備)
uPSD3253AV-24T1T Flash Programmable System Devices with 8032 Microcontroller Core
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參數(shù)描述
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UPSD3235A-24T6 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core
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