參數(shù)資料
型號(hào): P89LPC985FDH,529
廠商: NXP Semiconductors
文件頁(yè)數(shù): 48/85頁(yè)
文件大小: 0K
描述: IC 80C51 MCU KB FLASH 28TSSOP
標(biāo)準(zhǔn)包裝: 51
系列: LPC900
核心處理器: 8051
芯體尺寸: 8-位
速度: 18MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 26
程序存儲(chǔ)器容量: 8KB(8K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-TSSOP(0.173",4.40mm 寬)
包裝: 管件
P89LPC980_982_983_985
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 4 — 15 June 2010
52 of 85
NXP Semiconductors
P89LPC980/982/983/985
8-bit microcontroller with accelerated two-clock 80C51 core
7.25 Analog comparators
Two analog comparators are provided on the P89LPC980/982/983/985. Input and output
options allow use of the comparators in a number of different configurations. Comparator
operation is such that the output is a logical one (which may be read in a register and/or
routed to a pin) when the positive input (one of two selectable pins) is greater than the
negative input (selectable from a pin or an internal reference voltage). Otherwise the
output is a zero. Each comparator may be configured to cause an interrupt when the
output value changes.
The overall connections to both comparators are shown in Figure 18. The comparators
function to VDD =2.4 V.
When each comparator is first enabled, the comparator output and interrupt flag are not
guaranteed to be stable for 10
μs. The corresponding comparator interrupt should not be
enabled during that time, and the comparator interrupt flag must be cleared before the
interrupt is enabled in order to prevent an immediate interrupt service.
When a comparator is disabled the comparator’s output, COn, goes HIGH. If the
comparator output was LOW and then is disabled, the resulting transition of the
comparator output from a LOW to HIGH state will set the comparator flag, CMFn. This will
cause an interrupt if the comparator interrupt is enabled. The user should therefore
disable the comparator interrupt prior to disabling the comparator. Additionally, the user
should clear the comparator flag, CMFn, after disabling the comparator.
Fig 17. SPI single master multiple slaves configuration
002aaa903
master
slave
8-BIT SHIFT
REGISTER
SPI CLOCK
GENERATOR
8-BIT SHIFT
REGISTER
MISO
MOSI
SPICLK
port
MISO
MOSI
SPICLK
SS
slave
8-BIT SHIFT
REGISTER
MISO
MOSI
SPICLK
SS
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