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| 型号： | P87LPC768BD,512 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 9/65页 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU 4K OTP 20-SOIC |
| 产品培训模块： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 标准包装： | 38 |
| 系列： | LPC700 |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 连通性： | I²C，UART/USART |
| 外围设备： | 欠压检测/复位，LED，POR，PWM，WDT |
| 输入/输出数： | 18 |
| 程序存储器容量： | 4KB（4K x 8） |
| 程序存储器类型： | OTP |
| RAM 容量： | 128 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 6 V |
| 数据转换器： | A/D 4x8b |
| 振荡器型： | 内部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 706 (CN2011-ZH PDF) |
| 其它名称： | 568-3218-5 935267360512 P87LPC768BD |
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Philips Semiconductors
Preliminary data
P87LPC768
Low power, low price, low pin count (20 pin) microcontroller
with 4 kB OTP 8-bit A/D, Pulse Width Modulator
2002 Mar 12
15
Internal Reference Voltage
An internal reference voltage generator may supply a default
reference when a single comparator input pin is used. The value of
the internal reference voltage, referred to as Vref, is 1.28 V ±10%.
Comparator Interrupt
Each comparator has an interrupt flag CMFn contained in its
configuration register. This flag is set whenever the comparator
output changes state. The flag may be polled by software or may be
used to generate an interrupt. The interrupt will be generated when
the corresponding enable bit ECn in the IEN1 register is set and the
interrupt system is enabled via the EA bit in the IEN0 register.
Comparators and Power Reduction Modes
Either or both comparators may remain enabled when Power Down
or Idle mode is activated. The comparators will continue to function
in the power reduction mode. If a comparator interrupt is enabled, a
change of the comparator output state will generate an interrupt and
wake up the processor. If the comparator output to a pin is enabled,
the pin should be configured in the push-pull mode in order to obtain
fast switching times while in power down mode. The reason is that
with the oscillator stopped, the temporary strong pull-up that
normally occurs during switching on a quasi-bidirectional port pin
does not take place.
Comparators consume power in Power Down and Idle modes, as
well as in the normal operating mode. This fact should be taken into
account when system power consumption is an issue.
Comparator Configuration Example
The code shown in Figure 7 is an example of initializing one
comparator. Comparator 1 is configured to use the CIN1A and
CMPREF inputs, outputs the comparator result to the CMP1 pin,
and generates an interrupt when the comparator output changes.
The interrupt routine used for the comparator must clear the
interrupt flag (CMF1 in this case) before returning.
SU01189
CmpInit:
mov
PT0AD,#30h
; Disable digital inputs on pins that are used
;
for analog functions: CIN1A, CMPREF.
anl
P0M2,#0cfh
; Disable digital outputs on pins that are used
orl
P0M1,#30h
;
for analog functions: CIN1A, CMPREF.
mov
CMP1,#24h
; Turn on comparator 1 and set up for:
;
– Positive input on CIN1A.
;
– Negative input from CMPREF pin.
;
– Output to CMP1 pin enabled.
call
delay10us
; The comparator has to start up for at
;
least 10 microseconds before use.
anl
CMP1,#0feh
; Clear comparator 1 interrupt flag.
setb
EC1
; Enable the comparator 1 interrupt. The
;
priority is left at the current value.
setb
EA
; Enable the interrupt system (if needed).
ret
; Return to caller.
Figure 7.
Pulse Width Modulator
The P87LPC768 contains four Pulse Width Modulated (PWM)
channels which generate pulses of programmable length and
interval. The output for PWM0 is on P0.1, PWM1 on P1.6, PWM2
on P1.7 and PWM3 on P0.0. After chip reset the internal output of
the each PWM channel is a “1.” Note that the state of the pin will
not reflect this if UCFG1.5, PRHI, is set to a zero. In this case
before the pin will reflect the state of the internal PWM output a “1”
must be written to each port bit that serves as a PWM output. A
block diagram is shown in Figure 8.
The interval between successive outputs is controlled by a 10–bit
down counter which uses the internal microcontroller clock as its
input. When bit 3 in the UCFG1 register is a “1” the microcontroller
clock, and therefore the PWM counter clock, has the same
frequency as the clock source FCPWM= FOSC. When bit 3 in the
UCFG1 register is a “0” the microcontroller and PWM counter clocks
operate at half the frequency of clock source, FCPWM = FOSC/2.
When the counter reaches underflow it is reloaded with a user
selectable value. This mechanism allows the user to set the PWM
frequency at any integer sub–multiple of the microcontroller clock
frequency. The repetition frequency of the PWM is given by:
fPWM = FCPWM / (CNSW+1)
where CNSW is contained in CNSW0 and CNSW1 as described in
the following tables.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P87LPC768BN | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low power, low price, low pin count 20 pin microcontroller with 4 kB OTP 8-bit A/D,and Pulse Width Modulator |
| P87LPC768FD | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low power, low price, low pin count 20 pin microcontroller with 4 kB OTP 8-bit A/D,and Pulse Width Modulator |
| P87LPC768FD,512 | 功能描述:8位微控制器 -MCU 80C51 4K/128 OTP ADC RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| P87LPC768FN | 制造商:NXP Semiconductors 功能描述:MCU 8-Bit 87LP 80C51 CISC 4KB EPROM 5V 20-Pin PDIP |
| P87LPC768FN,112 | 功能描述:8位微控制器 -MCU 80C51 4K/128 OTP ADC RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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