参数资料
型号: P89V51RD2FA,512
厂商: NXP Semiconductors
文件页数: 28/80页
文件大小: 0K
描述: IC 80C51 MCU FLASH 64K 44-PLCC
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 26
系列: 89V
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
产品目录页面: 706 (CN2011-ZH PDF)
配用: 622-1017-ND - BOARD 44-ZIF PLCC SOCKET
622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP
其它名称: 568-1290-5
935276046512
P89V51RD2FA
P89V51RB2_RC2_RD2_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
34 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
In this mode, there are two options selected by bit EXEN2 in T2CON register. If
EXEN2 = 0, then Timer 2 counts up to 0FFFFH and sets the TF2 (Overow Flag) bit upon
overow. This causes the Timer 2 registers to be reloaded with the 16-bit value in
RCAP2L and RCAP2H. The values in RCAP2L and RCAP2H are preset by software
means.
Auto reload frequency when Timer 2 is counting up can be determined from this formula:
(1)
Where SupplyFrequency is either fosc (C/T2 = 0) or frequency of signal on T2 pin
(C/T2 = 1).
If EXEN2 = 1, a 16-bit reload can be triggered either by an overow or by a 1-to-0
transition at input T2EX. This transition also sets the EXF2 bit. The Timer 2 interrupt, if
enabled, can be generated when either TF2 or EXF2 is ‘1’.
Microcontroller’s hardware will need three consecutive machine cycles in order to
recognize falling edge on T2EX and set EXF2 = 1: in the rst machine cycle pin T2EX has
to be sampled as ‘1’; in the second machine cycle it has to be sampled as ‘0’, and in the
third machine cycle EXF2 will be set to ‘1’.
In Figure 14, DCEN = 1 and Timer 2 is enabled to count up or down. This mode allows pin
T2EX to control the direction of count. When a logic ‘1’ is applied at pin T2EX Timer 2 will
count up. Timer 2 will overow at 0FFFFH and set the TF2 ag, which can then generate
an interrupt, if the interrupt is enabled. This timer overow also causes the 16-bit value in
RCAP2L and RCAP2H to be reloaded into the timer registers TL2 and TH2.
Fig 13. Timer 2 in auto-reload mode (DCEN = 0)
002aaa524
OSC
÷6
T2 pin
C/T2 = 0
C/T2 = 1
TL2
(8-bits)
TH2
(8-bits)
TF2
control
reload
TR2
timer 2
interrupt
EXF2
RCAP2L RCAP2H
control
EXEN2
transition
detector
T2EX pin
SupplyFrequency
65536
RCAP2H RCAP2L
,
()
()
--------------------------------------------------------------------------------
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相关代理商/技术参数
参数描述
P89V51RD2FBC 制造商:NXP Semiconductors 功能描述:
P89V51RD2FBC,557 功能描述:8位微控制器 -MCU 80C51 64K FL / 1K RM 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
P89V51RD2FBC557 制造商:NXP 功能描述:
P89V51RD2FN 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM
P89V51RD2FN,112 功能描述:8位微控制器 -MCU 80C51 64K FL / 1K RM 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