參數(shù)資料
型號(hào)： P87C552
廠商： NXP Semiconductors N.V.
英文描述： 80C51 8-bit microcontroller(80C51八位微控制器)
中文描述： 80C51的8位微控制器（80C51的八位微控制器）
文件頁(yè)數(shù)： 20/74頁(yè)
文件大?。?/td> 368K
代理商： P87C552
Philips Semiconductors
Preliminary specification
P87C552
80C51 8-bit microcontroller
8K/256 OTP, 8 channel 10 bit A/D, I
2
C, PWM,
capture/compare, high I/O, low voltage (2.7V–5.5V), low power
1999 Mar 30
20
Timer T3, The Watchdog Timer
In addition to Timer T2 and the standard timers, a watchdog timer is
also incorporated on the 8xC552. The purpose of a watchdog timer
is to reset the microcontroller if it enters erroneous processor states
(possibly caused by electrical noise or RFI) within a reasonable
period of time. An analogy is the “dead man’s handle” in railway
locomotives. When enabled, the watchdog circuitry will generate a
system reset if the user program fails to reload the watchdog timer
within a specified length of time known as the “watchdog interval.”
Watchdog Circuit Description:
The watchdog timer (Timer T3)
consists of an 8-bit timer with an 11-bit prescaler as shown in
Figure 17. The prescaler is fed with a signal whose frequency is
1/12 the oscillator frequency (1MHz with a 12MHz oscillator). The
8-bit timer is incremented every “t” seconds, where:
t = 12
×
2048
×
1/f
OSC
(= 1.5ms at f
OSC
= 16MHz)
If the 8-bit timer overflows, a short internal reset pulse is generated
which will reset the 8xC552. A short output reset pulse is also
generated at the RST pin. This short output pulse (3 machine
cycles) may be destroyed if the RST pin is connected to a capacitor.
This would not, however, affect the internal reset operation.
Watchdog operation is activated when external pin EW is tied low.
When EW is tied low, it is impossible to disable the watchdog
operation by software.
How to Operate the Watchdog Timer:
The watchdog timer has to
be reloaded within periods that are shorter than the programmed
watchdog interval; otherwise the watchdog timer will overflow and a
system reset will be generated. The user program must therefore
continually execute sections of code which reload the watchdog
timer. The period of time elapsed between execution of these
sections of code must never exceed the watchdog interval. When
using a 16MHz oscillator, the watchdog interval is programmable
between 1.5ms and 392ms.
In order to prepare software for watchdog operation, a programmer
should first determine how long his system can sustain an
erroneous processor state. The result will be the maximum
watchdog interval. As the maximum watchdog interval becomes
shorter, it becomes more difficult for the programmer to ensure that
the user program always reloads the watchdog timer within the
watchdog interval, and thus it becomes more difficult to implement
watchdog operation.
The programmer must now partition the software in such a way that
reloading of the watchdog is carried out in accordance with the above
requirements. The programmer must determine the execution times
of all software modules. The effect of possible conditional branches,
subroutines, external and internal interrupts must all be taken into
account. Since it may be very difficult to evaluate the execution
times of some sections of code, the programmer should use worst
case estimations. In any event, the programmer must make sure
that the watchdog is not activated during normal operation.
The watchdog timer is reloaded in two stages in order to prevent
erroneous software from reloading the watchdog. First PCON.4
(WLE) must be set. The T3 may be loaded. When T3 is loaded,
PCON.4 (WLE) is automatically reset. T3 cannot be loaded if
PCON.4 (WLE) is reset. Reload code may be put in a subroutine as
it is called frequently. Since Timer T3 is an up-counter, a reload
12MHz oscillator), and a reload value of 0FFH gives the minimum
watchdog interval (2ms with a 12MHz oscillator).
In the idle mode, the watchdog circuitry remains active. When
watchdog operation is implemented, the power-down mode cannot
be used since both states are contradictory. Thus, when watchdog
operation is enabled by tying external pin EW low, it is impossible to
enter the power-down mode, and an attempt to set the power-down
bit (PCON.1) will have no effect. PCON.1 will remain at logic 0.
INTERNAL BUS
TIMER T3 (8-BIT)
LOAD LOADEN
PRESCALER (11-BIT)
CLEAR
f
OSC
/12
EW
WLE
CLEAR
PD
LOADEN
RST
R
RST
V
DD
P
INTERNAL
RESET
INTERNAL BUS
WRITE T3
PCON.4
PCON.1
OVERFLOW
SU00955
Figure 17. Watchdog Timer
相關(guān)PDF資料
PDF描述
P87C554SBBD 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP
P83C554SBBD 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP
P80C554SBBD 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP
P87C554SFBD 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP
P83C554SFBD 80C51 8-bit microcontroller . 6 clock operation 16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O, 64L LQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P87C552OTP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller
P87C552SBAA 制造商:NXP Semiconductors 功能描述:87C 16MHz 制造商:NXP Semiconductors 功能描述:87C 16MHz Bulk 制造商:NXP Semiconductors 功能描述:IC 8-BIT MCU 8K OTP PLCC68 制造商:NXP Semiconductors 功能描述:MCU 8-Bit 87C 80C51 CISC 8KB EPROM 3.3V/5V 68-Pin PLCC
P87C552SBAA,512 功能描述:8位微控制器 -MCU 80C51 8K/256 OTP 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(chǔ)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
P87C552SBAA512 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 16MHZ LCC-68
P87C552SFAA 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU SMD 87C552 PLCC68
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