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| 型号： | DS87C550-QCL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/49页 |
| 文件大小： | 0K |
| 描述： | IC MCU EPROM ADC/PWM HS 68-PLCC |
| 标准包装： | 18 |
| 系列： | 87C |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 33MHz |
| 连通性： | EBI/EMI，SIO，UART/USART |
| 外围设备： | 电源故障复位，PWM，WDT |
| 输入/输出数： | 55 |
| 程序存储器容量： | 8KB（8K x 8） |
| 程序存储器类型： | OTP |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 数据转换器： | A/D 6x10b |
| 振荡器型： | 外部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 68-LCC（J 形引线） |
| 包装： | 管件 |
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DS87C550 EPROM High-Speed Microcontroller with ADC and PWM
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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 User's Guide.
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.
When the LSB of timer/counter 2 (TL2) overflows, flag TF2B (T2SEL.4) is set, and flag TF2 (T2CON.7)
is set when the high byte (TH2) overflows. Setting flag TF2 also sets flag TF2B. Even though only one
interrupt is available for Timer 2, either or both of these overflows can be programmed to request an
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相关代理商/技术参数 |
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| DS87C550-QCL+ | 功能描述:IC MCU EPROM ADC/PWM HS 68-PLCC RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:87C 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:260 系列:73S12xx 核心处理器:80515 芯体尺寸:8-位 速度:24MHz 连通性:I²C，智能卡，UART/USART，USB 外围设备:LED，POR，WDT 输入/输出数:9 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-VFQFN 裸露焊盘 包装:管件 |
| DS87C550-QCW | 制造商:Maxim Integrated Products 功能描述:DS87C550 WAIVERED FOR LS & MARKING - Rail/Tube |
| DS87C550-QNL | 功能描述:IC MCU EPROM ADC/PWM HS 68-PLCC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:87C 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:260 系列:73S12xx 核心处理器:80515 芯体尺寸:8-位 速度:24MHz 连通性:I²C，智能卡，UART/USART，USB 外围设备:LED，POR，WDT 输入/输出数:9 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:2K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-VFQFN 裸露焊盘 包装:管件 |
| DS88 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DS8800 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Dual Voltage Level Translator |
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