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| 型號： | P89CV51RB2FA,512 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 29/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 80C51 MCU FLASH 16K 44-PLCC |
| 產(chǎn)品培訓(xùn)模塊： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 標(biāo)準(zhǔn)包裝： | 1,300 |
| 系列： | 89C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 40MHz |
| 連通性： | EBI/EMI，SPI，UART/USART |
| 外圍設(shè)備： | POR，PWM，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器容量： | 16KB（16K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 706 (CN2011-ZH PDF) |
| 其它名稱： | 568-4252-5 935284111512 P89CV51RB2FA |
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P89CV51RB2_RC2_RD2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 25 August 2009
35 of 76
NXP Semiconductors
P89CV51RB2/RC2/RD2
80C51 with 1 kB RAM, SPI
The Baud rate generator mode is like the Auto-reload mode, when a roll-over in TH2
causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and
RCAP2L, which are preset by software.
The baud rates in modes 1 and 3 are determined by Timer 2’s overow rate given below:
Modes 1 and 3 baud rates = Timer 2 overow rate / 16
The timer can be congured for either ‘timer’ or ‘counter’ operation. In many applications,
it is congured for ‘timer' operation (C/T2 = 0). Timer operation is different for Timer 2
when it is being used as a baud rate generator.
Usually, as a timer it would increment at every machine cycle (i.e., 1
6 the oscillator
frequency). As a baud rate generator, it increments at the oscillator frequency. Thus the
baud rate formula is shown in Equation 3:
Modes 1 and 3 baud rates =
(3)
Where: (RCAP2H, RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
The Timer 2 in Baud rate generator mode is valid only if RCLK and/or TCLK = 1 in T2CON
register. Note that a roll-over in TH2 does not set TF2, and will not generate an interrupt.
Thus, the Timer 2 interrupt does not have to be disabled when Timer 2 is in the Baud rate
generator mode. Also if the EXEN2 (T2 external enable ag) is set, a 1-to-0 transition in
T2EX (timer/counter 2 trigger input) will set EXF2 (T2 external ag) but will not cause a
reload from (RCAP2H, RCAP2L) to (TH2, TL2). Therefore when Timer 2 is used as a
baud rate generator, T2EX can be used as an additional external interrupt, if needed.
When Timer 2 is in the Baud rate generator mode, one should not try to read or write TH2
and TL2. Under these conditions, a read or write of TH2 or TL2 may not be accurate. The
RCAP2 registers may be read, but should not be written to, because a write might overlap
a reload and cause write and/or reload errors. The timer should be turned off (clear TR2)
before accessing the Timer 2 or RCAP2 registers. Table 23 shows commonly used baud
rates and how they can be obtained from Timer 2.
6.5.5 Summary of baud rate equations
Timer 2 is in Baud rate generator mode: if Timer 2 is being clocked through pin T2 (P1[0])
the baud rate is:
Baud rate = Timer 2 overow rate / 16
If Timer 2 is being clocked internally, the baud rate is:
Baud rate = fosc / (16 × (65536 (RCAP2H, RCAP2L)))
Where fosc = oscillator frequency
To obtain the reload value for RCAP2H and RCAP2L, this equation can be rewritten as:
RCAP2H, RCAP2L = 65536
f
osc / (16 × baud rate)
OscillatorFrequency
16
65536
RCAP2H RCAP2L
,
()
–
()
×
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P89CV51RB2FBC | 功能描述:8位微控制器 -MCU 80C51 16K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89CV51RB2FBC,557 | 功能描述:8位微控制器 -MCU 80C51 16K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89CV51RC2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 64 kB flash microcontroller with 1 kB RAM, SPI, 6-clock CPU with 6/12-clock peripherals |
| P89CV51RC2FA | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 64 kB flash microcontroller with 1 kB RAM, SPI, 6-clock CPU with 6/12-clock peripherals |
| P89CV51RC2FA,512 | 功能描述:8位微控制器 -MCU 80C51 32K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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