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參數(shù)資料
| 型號： | P89LV51RB2BA |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MS-018, SOT-187-2, LCC-44 |
| 文件頁數(shù)： | 54/77頁 |
| 文件大小： | 349K |
| 代理商： | P89LV51RB2BA |
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Philips Semiconductors
P89LV51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 04 — 02 December 2004
54 of 77
9397 750 14342
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
1. Periodically change the compare value so it will never match the PCA timer.
2. Periodically change the PCA timer value so it will never match the compare
values.
3. Disable the Watchdog by clearing the WDTE bit before a match occurs and then
re-enable it.
The first two options are more reliable because the Watchdog timer is never disabled
as in option #3. If the program counter ever goes astray, a match will eventually occur
and cause an internal reset. The second option is also not recommended if other
PCA modules are being used. Remember, the PCA timer is the time base for
all
modules; changing the time base for other modules would not be a good idea. Thus,
in most applications the first solution is the best option.
;CALL the following WATCHDOG subroutine periodically.
CLR
EA
;Hold off interrupts
MOV
CCAP4L,#00
;Next compare value is within 255 counts of
current PCA timer value
MOV
CCAP4H,CH
SETB
EA
;Re-enable interrupts
RET
This routine should not be part of an interrupt service routine, because if the program
counter goes astray and gets stuck in an infinite loop, interrupts will still be serviced
and the Watchdog will keep getting reset. Thus, the purpose of the Watchdog would
be defeated. Instead, call this subroutine from the main program within 2
16
count of
the PCA timer.
7.9 Security Bit
The Security Bit protects against software piracy and prevents the contents of the
flash from being read by unauthorized parties in Parallel Programmer Mode. It also
protects against code corruption resulting from accidental erasing and programming
to the internal flash memory.
When the Security Bit is activated all parallel programming commands except for
Chip-Erase are ignored (thus the device cannot be read). However, ISP reading,
writing, or erasing of the user’s code can still be performed if the serial number and
length has not been programmed.
Therefore, when a user requests to program
the Security Bit, the programmer should prompt the user and program a serial
number into the device.
7.10 Interrupt priority and polling sequence
The device supports eight interrupt sources under a four level priority scheme.
Table 45
summarizes the polling sequence of the supported interrupts. Note that the
SPI serial interface and the UART share the same interrupt vector. (See
Figure 27
).
Table 45:
Description
Interrupt polling sequence
Interrupt Flag
Vector
Address
0003H
004BH
000BH
Interrupt
Enable
EX0
EBO
ET0
Interrupt
Priority
PX0/H
PBO/H
PT0/H
Service
Priority
1 (highest)
2
3
Wake-Up
Power-down
yes
no
no
Ext. Int0
Brown-out
T0
IE0
-
TF0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P89LV51RB2BA,512 | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 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 |
| P89LV51RB2BBC | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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 |
| P89LV51RB2BBC,557 | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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 |
| P89LV51RC2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RC2BN | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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 |
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