參數(shù)資料
型號(hào)： P89LPC924
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
中文描述： 8 -加速雙位單片機(jī)80C51的時(shí)鐘4 KB的核心/ 8 KB的3伏的低功耗Flash 8位A / D轉(zhuǎn)換器
文件頁(yè)數(shù)： 22/49頁(yè)
文件大?。?/td> 233K
代理商： P89LPC924
Philips Semiconductors
P89LPC924/925
8-bit microcontrollers with accelerated two-clock 80C51 core
Product data
Rev. 03 — 15 December 2004
22 of 49
9397 750 14471
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.11 Data RAM arrangement
The 256 bytes of on-chip RAM are organized as shown in
Table 5
.
8.12 Interrupts
The P89LPC924/925 uses a four priority level interrupt structure. This allows great
flexibility in controlling the handling of the many interrupt sources. The
P89LPC924/925 supports 13 interrupt sources: A/D converter, external interrupts 0
and 1, timers 0 and 1, serial port Tx, serial port Rx, combined serial port Rx/Tx,
brownout detect, watchdog/real-time clock, I
2
C, keyboard, and comparators 1 and 2.
Each interrupt source can be individually enabled or disabled by setting or clearing a
bit in the interrupt enable registers IEN0 or IEN1. The IEN0 register also contains a
global disable bit, EA, which disables all interrupts.
Each interrupt source can be individually programmed to one of four priority levels by
setting or clearing bits in the interrupt priority registers IP0, IP0H, IP1, and IP1H. An
interrupt service routine in progress can be interrupted by a higher priority interrupt,
but not by another interrupt of the same or lower priority. The highest priority interrupt
service cannot be interrupted by any other interrupt source. If two requests of
different priority levels are pending at the start of an instruction, the request of higher
priority level is serviced.
If requests of the same priority level are pending at the start of an instruction, an
internal polling sequence determines which request is serviced. This is called the
arbitration ranking. Note that the arbitration ranking is only used to resolve pending
requests of the same priority level.
8.12.1
External interrupt inputs
The P89LPC924/925 has two external interrupt inputs as well as the Keypad Interrupt
function. The two interrupt inputs are identical to those present on the standard
80C51 microcontrollers.
These external interrupts can be programmed to be level-triggered or edge-triggered
by setting or clearing bit IT1 or IT0 in Register TCON.
In edge-triggered mode if successive samples of the INTn pin show a HIGH in one
cycle and a LOW in the next cycle, the interrupt request flag IEn in TCON is set,
causing an interrupt request.
If an external interrupt is enabled when the P89LPC924/925 is put into Power-down
or Idle mode, the interrupt will cause the processor to wake-up and resume operation.
Refer to
Section 8.15 “Power reduction modes”
for details.
Table 5:
Type
DATA
IDATA
On-chip data memory usages
Data RAM
Memory that can be addressed directly and indirectly
Memory that can be addressed indirectly
Size (bytes)
128
256
相關(guān)PDF資料
PDF描述
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
P89LPC933 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
P89LPC934 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
P89LPC935 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89LPC9241 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 2 kB/4 kB/8 kB 3 V byte-erasable flash with 8-bit ADC
P89LPC9241FDH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 2 kB/4 kB/8 kB 3 V byte-erasable flash with 8-bit ADC
P89LPC9241FDH,112 功能描述:8位微控制器 -MCU MCU 8-Bit CISC 4KB Flash2.5V/3.3V 20Pin 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
P89LPC924FDH 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 4K FLASH TSSOP20
P89LPC924FDH,518 功能描述:8位微控制器 -MCU 4K FL/256B 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
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