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參數(shù)資料
| 型號： | P89V51RB2BA |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MS-018, SOT-187-2, LCC-44 |
| 文件頁數(shù)： | 15/77頁 |
| 文件大?。?/td> | 350K |
| 代理商： | P89V51RB2BA |
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Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
15 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Figure 5
. Note that if an RC circuit is being used, provisions should be made to
ensure the V
DD
rise time does not exceed 1 millisecond and the oscillator start-up
time does not exceed 10 milliseconds.
For a low frequency oscillator with slow start-up time the reset signal must be
extended in order to account for the slow start-up time. This method maintains the
necessary relationship between V
DD
and RST to avoid programming at an
indeterminate location, which may cause corruption in the code of the flash. The
power-on detection is designed to work during initial power up, before the voltage
reaches the brown-out detection level. The POF flag in the PCON register is set to
indicate an initial power up condition. The POF flag will remain active until cleared by
software.
Following a power-on or external reset the P89V51RB2/RC2/RD2 will force the SWR
and BSEL bits (FCF[1:0]) = 00. This causes the bootblock to be mapped into the
lower 8 kB of code memory and the device will execute the ISP code in the boot block
and attempt to autobaud to the host. If the autobaud is successful the device will
remain in ISP mode. If, after approximately 400 ms, the autobaud is unsuccessful the
boot block code will check to see if the SoftICE flag is set (from a previous
programming operation). If the SoftICE flag is set the device will enter SoftICE mode.
If the SoftICE flag is cleared, the bootcode will execute a software reset causing the
device to execute the user code from block 0 starting at address 0000h. Note that an
external reset applied to the RST pin has the same effect as a power-on reset.
7.1.3
Software reset
A software reset is executed by changing the SWR bit (FCF.1) from ‘0’ to ‘1’. A
software reset will reset the program counter to address 0000H and force both the
SWR and BSEL bits (FCF[1:0]) =10. This will result in the lower 8 kB of the user code
memory being mapped into the user code memory space. Thus the user's code will
be executed starting at address 0000h. A software reset will not change WDTC.2 or
RAM data. Other SFRs will be set to their reset values.
Fig 5.
Power-on reset circuit.
002aaa543
VDD
VDD
8.2 k
W
RST
XTAL2
XTAL1
C1
C2
10
m
F
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| P89V51RB2BBC | 功能描述:8位微控制器 -MCU 16K/512 FL 12 CLK ISP/IAP COMM 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 安裝風格:SMD/SMT |
| P89V51RB2BBC,557 | 功能描述:8位微控制器 -MCU 16K/512 FL 12 CLK 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 安裝風格:SMD/SMT |
| P89V51RB2FA | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 16K FLASH PLCC44 |
| P89V51RB2FA,529 | 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 安裝風格:SMD/SMT |
| P89V51RB2FA529 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44 |
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