參數(shù)資料
型號(hào)： P89LPC913
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
中文描述： 8位微控制器兩個(gè)小時(shí)80C51的核心具有1KB 3伏閃光的128字節(jié)RAM
文件頁(yè)數(shù)： 45/63頁(yè)
文件大?。?/td> 314K
代理商： P89LPC913
Philips Semiconductors
P89LPC912/913/914
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 03 — 17 December 2004
45 of 63
9397 750 14468
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
In order to use the Keypad Interrupt as an original KBI function like in 87LPC76x
series, the user needs to set KBPATN = 0FFH and PATN_SEL = 1 (not equal), then
any key connected to Port 0 which is enabled by the KBMASK register will cause the
hardware to set KBIF and generate an interrupt if it has been enabled. The interrupt
may be used to wake up the CPU from Idle or Power-down modes. This feature is
particularly useful in handheld, battery-powered systems that need to carefully
manage power consumption yet also need to be convenient to use.
In order to set the flag and cause an interrupt, the pattern on Port 0 must be held
longer than 6 CCLKs.
9.24 Watchdog timer
The watchdog timer causes a system reset when it underflows as a result of a failure
to feed the timer prior to the timer reaching its terminal count. It consists of a
programmable 12-bit prescaler, and an 8-bit down counter. The down counter is
decremented by a tap taken from the prescaler. The clock source for the prescaler is
either the PCLK or the nominal 400 kHz Watchdog oscillator. The watchdog timer can
only be reset by a power-on reset. When the watchdog feature is disabled, it can be
used as an interval timer and may generate an interrupt.
Figure 23
shows the
watchdog timer in Watchdog mode. Feeding the watchdog requires a two-byte
sequence. If PCLK is selected as the watchdog clock and the CPU is powered-down,
the watchdog is disabled. The watchdog timer has a time-out period that ranges from
a few
μ
s to a few seconds. Please refer to the P89LPC912/913/914 User’s Manualfor
more details.
(1) Watchdog reset can also be caused by an invalid feed sequence, or by writing to WDCON not immediately followed by a
feed sequence.
Fig 23. Watchdog timer in Watchdog mode (WDTE = ‘1’).
PRE2
PRE1
PRE0
–
–
WDRUN
WDTOF
WDCLK
WDCON (A7H)
CONTROL REGISTER
PRESCALER
002aaa423
SHADOW
REGISTER
FOR WDCON
8-BIT DOWN
COUNTER
WDL (C1H)
Watchdog
oscillator
PCLK
÷
32
MOV WFEED1, #0A5H
MOV WFEED2, #05AH
RESET
see note (1)
相關(guān)PDF資料
PDF描述
P89LPC914 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
P89LPC914FDH 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
P89LPC924 8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
P89LPC925 8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
P89LPC930 8-bit microcontrollers with two-clock 80C51 core 4 kB/8 kB 3 V Flash with 256-byte data RAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89LPC913FDH 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 1K FLASH TSSOP14
P89LPC913FDH,129 功能描述:8位微控制器 -MCU 1K FL/128B RAM/SPI 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
P89LPC913FDH129 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述:
P89LPC913FDH-S 功能描述:8位微控制器 -MCU 1K FL/128B RAM/SPI 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
P89LPC914 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
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