參數(shù)資料
型號(hào)： P87C055
廠商： NXP Semiconductors N.V.
英文描述： Microcontrollers for TV and video MTV
中文描述： 電視和視頻微控制器MTV
文件頁(yè)數(shù)： 9/40頁(yè)
文件大小： 243K
代理商： P87C055
1996 Mar 22
9
Philips Semiconductors
Product specification
Microcontrollers for TV and video (MTV)
83C145; 83C845
83C055; 87C055
10 6-BIT PWM DACS
Figure 3 shows the 6-bit PWM DAC logic circuit, consisting
of 8 PWMn modules.
The basic MCU clock is divided by 4 to get a waveform that
clocks a 14-bit counter which is common to all the PWMs
(including the 14-bit PWM). This divided clock is hereafter
called the PWM clock.
As illustrated in Fig.3, the lower-precision (6-bit) PWMs
use the least significant part of the 14-bit counter.
Figure 4 shows the circuit diagram of a 6-bit PWM module.
Each PWM module has a Special Function Register
PWMn; n = 0 to 7. The register format is shown in Table 6.
10.1
PWM DAC operation
Value field PVn5 to PVn0 of each PWMn register
(n = 0 to 7) is compared to the 6 LSBs of the common
counter (14-bit counter).
When the value matches, the output flip-flop is cleared, so
that the output pin is driven LOW.
When the value rolls over to zero, the output flip-flop is set,
so that the output pin is released. Thus the output
waveform has a fixed period of 64 PWM clock cycles; its
duty cycle is determined by contents of PWMn.5 to
PWMn.0 (PVn5 to PVn0).
Three of the nine total PWM modules (8 PWMn and the
14-bit PWM DAC) operate as previously described; for
three others, both the rising and falling edges of the output
are delayed by one PWM clock; for the remaining three,
both edges are delayed by two PWM clocks. This feature
reduces the radio-frequency emission that would
otherwise occur when the counter rolled over to zero and
all nine open-drain outputs were released.
10.2
Special Function Register PWMn (n = 0 to 7)
Table 6
Special Function Register PWMn (n = 0 to 7; addresses D4H to DFH)
Table 7
Description of PWMn bits
7
6
5
4
3
2
1
0
PWnE
PVn5
PVn4
PVn3
PVn2
PVn1
PVn0
BIT
SYMBOL
DESCRIPTION
7
PWnE
PWM module enable bit. If for a particular PWM block (n) the bit:
PWnE = 1, then the block is active and controls its assigned port pin.
PWnE = 0, the corresponding port pin is controlled by the port.
Reserved.
PVn5 to PVn0 Value field for PWMn register.
6
5 to 0
相關(guān)PDF資料
PDF描述
P87C055BBP Microcontrollers for TV and video MTV
P83C055BBP Microcontrollers for TV and video MTV
P83C145BBP MICRO 21 F SOD
P83C851FBA CMOS single-chip 8-bit microcontroller with on-chip EEPROM
P80C851IBA CMOS single-chip 8-bit microcontroller with on-chip EEPROM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P87C055BBNB 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
P87C055BBP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Microcontrollers for TV and video MTV
P87C151SA 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:HIGH-PERFORMANCE CHMOS MICROCONTROLLER
P87C151SB 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:HIGH-PERFORMANCE CHMOS MICROCONTROLLER
P87C251SA16 功能描述:IC MCU 8-BIT 8K 16MHZ OTP 40-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*