參數(shù)資料
型號(hào)： DS87C550
英文描述： EPROM High-Speed Micro with A/D and PWM
中文描述： 存儲(chǔ)器高速微與A / D及PWM
文件頁(yè)數(shù)： 26/50頁(yè)
文件大小： 763K
代理商： DS87C550
DS87C550
26 of 50
16-BIT MODE
For more precise PWM operations, two 8-bit PWMs may be combined into a single 16-bit PWM
function. By setting SFR bit PWE0 (PWMADR.0) to a 1, a new 16-bit PWM0 function is formed from
the 8-bit PWM functions PWM0 (LSB) and PWM1 (MSB). Similarly, by setting PWE1 (PWMADR.1) to
a 1, a new 16-bit PWM1 function is formed from PWM2 (LSB) and PWM3 (MSB). Since each pair of
PWMs can be independently configured into a 16-bit arrangement, the user has the option of having four
8-bit PWM functions, two 8-bit PWM functions and a 16-bit PWM function, or two 16-bit PWM
functions.
In 16-bit PWM mode, the prescaler operates exactly as it did in 8-bit mode. Its outputs are available to all
four clock generator blocks. However in 16-bit mode, the clock generators for 8-bit PWM1 and PWM3
are not functional. The clock for 16-bit PWM0 function is provided by the clock generator for 8-bit
PWM0 and the clock for 16-bit PWM1 function is provided by the clock generator for 8-bit PWM2. The
SFR bits PW0EN (clock generator enable) and PW0S2:0 (clock select bits) provide the programmable
clock controls for 16-bit PWM channel 0, and bits PW2EN and PW2S2:0 provide the programmable
clock controls for 16-bit PWM channel 1. The clock divisor values for the 16-bit PWM operating
frequency are contained in the PW0FG and PW2FG registers for 16-bit PWM0 and PWM1
(respectively). Note that these registers remain 8-bit values so the clock division remains the same for
16-bit and 8-bit operation.
When in 16-bit mode, the two 8-bit pulse generator timers are concatenated together forming a 16-bit
timer. Therefore the pulse generator section of a 16-bit PWM channel has a repetition rate of the input
clock divided by 65,536. As in 8-bit mode when the counter reaches 0, the output of the 16-bit PWM
channel is set (i.e., logic 1), and when it reaches the pre-loaded match value it is cleared (i.e., logic 0).
GENERAL PURPOSE TIMERS/COUNTERS
The DS87C550 contains three general-purpose timer/ counters. Timers 0 and 1 are standard 8051 16-bit
timer/counters with three modes of operation. Each of these devices can be used as a 13-bit timer/counter,
16-bit timer/counter or 8-bit timer/counter with auto-reload. Timer 0 can also operate as two 8-bit timer
counters. Each timer can also be used as a counter of external pulses on the corresponding T0 or T1 pin.
The mode of operation is controlled by the Timer Mode (TMOD) register. Each timer/counter consists of
a 16-bit register in 2 bytes, which can be found in the SFR map as TL0, TH0, TL1, and TH1. These two
timers are enabled by the Timer Control (TCON) register. A complete description of use and operation of
these timers may be found in the “High-Speed Microcontroller Data Book.”
Timer 2 is a true 16-bit timer/counter with several additional features as compared to timers 1 and 0. With
a 16-bit reload register (RLOADL, RLOADH), it provides up/down auto-reload timer/counters and timer
output clock generation. Timer 2 also supports a capture/compare function. This new feature provides
additional timing control capabilities for real-time applications with less CPU intervention. A more
detailed description of this capture/compare feature is provided below.
TIMER 2
The selection of a timer or counter function is controlled by the C/
T2
(T2CON.1) bit When C/
T2
is set to
1, Timer 2 acts as a counter where it counts 1 to 0 transitions on the T2 pin. When C/
T2
is cleared to a 0,
Timer 2 functions as a timer where it counts the system clock as determined by the T2M bit (CKCON.5)
and the clock divide control bits CD1, CD0 (PMR.7:6) and the 4X/
2X
(PMR.3) bit. A prescaler is used to
further divide the input clock by a programmable ratio. The prescaler value is programmable to divide by
1, 2, 4, and 8 as defined by the T2P1 and T2P0 (T2SEL.1:0) bits. Timer 2 is enabled by setting bit TR2
(T2CON.2) to a 1, and disabled by clearing it to a 0.
相關(guān)PDF資料
PDF描述
DS87C550-QCL EPROM High-Speed Micro with A/D and PWM
DS87C550-FCL EPROM High-Speed Micro with A/D and PWM
DS87C550-FNL EPROM High-Speed Micro with A/D and PWM
DS87C550-KCL EPROM High-Speed Micro with A/D and PWM
DS87C550-QNL EPROM High-Speed Micro with A/D and PWM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS87C550-FCL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-FNL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-KCL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-QCL 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM
DS87C550-QCL+ 功能描述:IC MCU EPROM ADC/PWM HS 68-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 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:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件
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