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| 型号： | P87LPC764BDH,518 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 18/60页 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU 4K OTP 20-TSSOP |
| 标准包装： | 2,500 |
| 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，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 |
| 振荡器型： | 内部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | P87LPC764BDH518 |
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Philips Semiconductors
Product data
P87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
2003 Sep 03
24
SU01167
CLOCK SELECT
CLOCK
SOURCES
CLOCK
OUT
XTAL
SELECT
INTERNAL RC OSCILLATOR
CRYSTAL: LOW FREQUENCY
CRYSTAL: MEDIUM FREQUENCY
CRYSTAL: HIGH FREQUENCY
EXTERNAL CLOCK INPUT
10-BIT RIPPLE COUNTER
RESET
COUNT
COUNT 256
COUNT 1024
OSCILLATOR STARTUP TIMER
DIVIDE-BY-M
(DIVM REGISTER)
AND
CLKR SELECT
CPU
CLOCK
÷1/÷2
CLKR
(UCFG1.3)
POWER DOWN
POWER MONITOR RESET
FOSC0 (UCFG1.0)
FOSC1 (UCFG1.1)
FOSC2 (UCFG1.2)
Figure 18. Block Diagram of Oscillator Control
CPU Clock Modification: CLKR and DIVM
For backward compatibility, the CLKR configuration bit allows
setting the P87LPC764 instruction and peripheral timing to match
standard 80C51 timing by dividing the CPU clock by two. Default
timing for the P87LPC764 is 6 CPU clocks per machine cycle while
standard 80C51 timing is 12 clocks per machine cycle. This
division also applies to peripheral timing, allowing 80C51 code that
is oscillator frequency and/or timer rate dependent. The CLKR bit
is located in the EPROM configuration register UCFG1, described
under EPROM Characteristics
In addition to this, the CPU clock may be divided down from the
oscillator rate by a programmable divider, under program control.
This function is controlled by the DIVM register. If the DIVM register
is set to zero (the default value), the CPU will be clocked by either
the unmodified oscillator rate, or that rate divided by two, as
determined by the previously described CLKR function.
When the DIVM register is set to some value N (between 1 and 255),
the CPU clock is divided by 2 * (N + 1). Clock division values from 4
through 512 are thus possible. This feature makes it possible to
temporarily run the CPU at a lower rate, reducing power consumption,
in a manner similar to Idle mode. By dividing the clock, the CPU can
retain the ability to respond to events other than those that can cause
interrupts (i.e. events that allow exiting the Idle mode) by executing its
normal program at a lower rate. This can allow bypassing the
oscillator startup time in cases where Power Down mode would
otherwise be used. The value of DIVM may be changed by the
program at any time without interrupting code execution.
Power Monitoring Functions
The P87LPC764 incorporates power monitoring functions designed
to prevent incorrect operation during initial power up and power loss
or reduction during operation. This is accomplished with two
hardware functions: Power-On Detect and Brownout Detect.
Brownout Detection
The Brownout Detect function allows preventing the processor from
failing in an unpredictable manner if the power supply voltage drops
below a certain level. The default operation is for a brownout
detection to cause a processor reset, however it may alternatively
be configured to generate an interrupt by setting the BOI bit in the
AUXR1 register (AUXR1.5).
The P87LPC764 allows selection of two Brownout levels: 2.5 V or
3.8 V. When VDD drops below the selected voltage, the brownout
detector triggers and remains active until VDD is returns to a level
above the Brownout Detect voltage. When Brownout Detect causes
a processor reset, that reset remains active as long as VDD remains
below the Brownout Detect voltage. When Brownout Detect
generates an interrupt, that interrupt occurs once as VDD crosses
from above to below the Brownout Detect voltage. For the interrupt
to be processed, the interrupt system and the BOI interrupt must
both be enabled (via the EA and EBO bits in IEN0).
When Brownout Detect is activated, the BOF flag in the PCON
register is set so that the cause of processor reset may be determined
by software. This flag will remain set until cleared by software.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P87LPC764BN | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 87LC764 DIP20 制造商:NXP Semiconductors 功能描述:IC, 8BIT MCU, 87LC764, DIP20 制造商:NXP Semiconductors 功能描述:IC, 8BIT MCU, 80C51, 20MHZ, DIP-20; Controller Family/Series:(8051) 8052; Core Size:8bit; No. of I/O's:18; Supply Voltage Min:2.7V; Supply Voltage Max:6V; Digital IC Case Style:DIP; No. of Pins:20; Program Memory Size:4KB ;RoHS Compliant: Yes 制造商:NXP Semiconductors 功能描述:P87LPC764BN 8bit microcontroller,20MHz 制造商:NXP Semiconductors 功能描述:MCU 8-Bit 87LP 80C51 CISC 4KB EPROM 5V 20-Pin PDIP |
| P87LPC764BN,112 | 功能描述:8位微控制器 -MCU 80C51 4K/128 OTP 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 |
| P87LPC764BN112 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 20MHZ DIP-20 |
| P87LPC764FD | 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 kbyte OTP |
| P87LPC764FD,512 | 功能描述:8位微控制器 -MCU 4K/128 OTP 2.7-6V EXT SO20 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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