Philips P89LPC903, P89LPC902 Oscillator Option Selection- P89LPC901, Clock Output P89LPC901

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Philips Semiconductors

User’s Manual - Preliminary -

 

 

 

 

 

 

CLOCKS

P89LPC901/902/903

 

Quartz crystal or ceramic resonator

The oscillator must be configured in one of the following modes:

-Low Frequency Crystal

-Medium Frequency Crystal

-High Frequency Crystal

*A series resistor may be required to limit crystal drive levels. This is especially

important for low frequency crystals.

 

P89LPC901

 

XTAL1

*

XTAL2

 

Figure 2-1: Using the Crystal Oscillator - P89LPC901

Oscillator Option Selection- P89LPC901

The oscillator option is selectable either by the FOSC2:0 bits in UCFG1 or by the RTCS1:0 bits in RTCCON. If the FOSC2:0 bits select an OSCCLK source of either the internal RC oscillator or the WDT oscillator, then the RTCS1:0 bits will select the oscillator option for the crystal oscillator. Otherwise, the crystal oscillator option is selected by FOSC2:0. See Table 6-1 and Table 6-2.

Clock Output - P89LPC901

The P89LPC901 supports a user selectable clock output function on the XTAL2 / CLKOUT pin when no crystal oscillator is being used. This condition occurs if another clock source has been selected (on-chip RC oscillator, watchdog oscillator, external clock input on X1) and if the Real-Time clock is not using the crystal oscillator as its clock source. This allows external devices to synchronize to the P89LPC901. This output is enabled by the ENCLK bit in the TRIM register

The frequency of this clock output is 1/2 that of the CCLK. If the clock output is not needed in Idle mode, it may be turned off prior to entering Idle, saving additional power. Note: on reset, the TRIM SFR is initialized with a factory preprogrammed value. Therefore when setting or clearing the ENCLK bit, the user should retain the contents of bits 5:0 of the TRIM register. This can be done by reading the contents of the TRIM register (into the ACC for example), modifying bit 6, and writing this result back into the TRIM register. Alternatively, the "ANL direct" or "ORL direct" instructions can be used to clear or set bit 6 of the TRIM register.

On-Chip RC oscillator Option

The P89LPC901/902/903 has a 6-bit field within the TRIM register that can be used to tune the frequency of the RC oscillator. During reset, the TRIM value is initialized to a factory pre-programmed value to adjust the oscillator frequency to 7.373 MHz, ±1%. (Note: the initial value is better than 1%; please refer to the datasheet for behavior over temperature). End user applications can write to the TRIM register to adjust the on-chip RC oscillator to other frequencies. Increasing the TRIM value will decrease the oscillator frequency.

2003 Dec 8

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Contents User Manual Philips SemiconductorsTable of Contents Power Monitoring Functions 103 P89LPC901/902/903 List of Figures Pin Configurations P89LPC902Logic Symbols Product comparisonBlock Diagram P89LPC901 CPUBlock Diagram P89LPC902 High Performance Accelerated 2-clock 80C51 CPUBlock Diagram P89LPC903 UartMnemonic PIN no Type Name and Function CIN1AKBI4 KBI5P3.1 XTAL1CMP2 KBI0CIN2A KBI2P1.0 TxDP1.1 RxDSpecial Function Registers Special Function Registers Table P89LPC901Bit Functions and Addresses Hex Special Function Registers Table P89LPC902 CMP1 Cmpref CIN1A KB2 KB0 KB6 KB5 KB4 A7H PRE2 PRE1 PRE0 Wdrun Wdtof Special Function Registers Table P89LPC903 F7H Psth PCH Pkbih TRIM.5 TRIM.4 TRIM.3 TRIM.2 TRIM.1 TRIM.0 WDCON# P89LPC901/902/903 Memory Organization DataSFR CodeGeneral Description Enhanced CPU Clock DefinitionsCPU Clock Oscclk Low Speed Oscillator Option P89LPC901Clock Output P89LPC901 Oscillator Option Selection- P89LPC901On-Chip RC oscillator Option BIT Symbol Function Watchdog Oscillator OptionExternal Clock Input Option P89LPC901 TrimHigh freq Med freqLow freq DivmAtchdog CPU Clock Cclk Wakeup Delay CPU Clock Cclk Modification Divm RegisterL K O sc illa to rP89LPC901/902/903 Low Power Select P89LPC901 P89LPC901/902/903 Interrupt Priority Structure Flag Bits Address Enable Bits Priority Ranking Summary of Interrupts P89LPC901 DescriptionInterrupt Arbitration Summary of Interrupts P89LPC902 DescriptionP89LPC901/902/903 External Interrupt Inputs External Interrupt Pin Glitch SuppressionTF1 ET1 TI & RI/RI ES/ESR Port Configurations Quasi-Bidirectional Output ConfigurationNumber of I/O Pins Available Clock Source Reset Option RSTOpen Drain Output Configuration Quasi-Bidirectional OutputPush-Pull Output Configuration P89LPC901/902/903 Input-Only ConfigurationPort 0 Analog Functions Additional Port Features Port Output Configuration P89LPC901Port Output Configuration P89LPC902 Port Output Configuration P89LPC903Ports Ports Tmod TMOD.7TMOD.6 TMOD.3Mode Tamod P89LPC901TAMOD.7-1 TAMOD.0Mode 6 P89LPC901 P89LPC901/902/903 ModeTcon Timer/Counter 0 or 1 in Mode 0 13-bit counter PclkPclk TL0 Timer Overflow toggle output P89LPC901TR0 ENT0 Pclk TH0 Timers 0 Real-time clock/system timer Block Diagram Real-time Clock SourceReal-time Clock/System Timer Clock Source P89LPC901 FOSC2 FOSC1 FOSC0 RTCS10UCFG1.2 UCFG1.1 UCFG1.0 Cclk Frequency RTC Clock Frequency XclkReset Sources Affecting the Real-time Clock Real-time Clock/System Timer Clock Source P89LPC902/903Changing RTCS1-0 Real-time Clock Interrupt/Wake UpRtccon Brownout Detection Power-On Detection Brownout OptionsP89LPC901/902/903 Power Reduction Modes Power Reduction ModesPcon Pcona Power Monitoring Functions Uart P89LPC903 P89LPC901/902/903 SFR Space Baud Rate Generator and SelectionUpdating the BRGR1 and BRGR0 SFRs SFR Locations for UARTsBreak Detect Framing ErrorBrgcon Scon More About Uart Mode SstatSerial Port Mode 0 Double Buffering Must Be Disabled Framing Error and RI in Modes 2 and 3 with SM2 = FE and RI when SM2 = 1 in Modes 2P89LPC901/902/903 More About Uart Modes 2 PCON.6 RB8 SMOD0P89LPC901/902/903 Double Buffering Double Buffering in Different Modes9th Bit Bit 8 in Double Buffering Modes 1, 2 Transmission with and without Double BufferingMultiprocessor Communications Automatic Address RecognitionUart P89LPC903 Uart P89LPC903 Power-On reset code execution Block Diagram of ResetRstsrc Comparator Configuration CMPnComparator Input and Output Connections P89LPC901 Comparator Interrupt Internal Reference VoltageCmpref Comparator and Power Reduction Modes Comparator Configuration ExampleKbpatn KBPATN.5,4Kbcon KbmaskKBMASK.7 KBMASK.6KBMASK.3 KBMASK.2Keypad Interrupt KBI Watchdog Function Watchdog timer configurationWdte Wdse Function Feed Sequence Wdcon Prescaler Reset Pclk P89LPC901/902/903 Watchdog Timeout ValuesWDCONA7H P89LPC901/902/903 Watchdog Timer in Timer Mode Power down operationWatchdog Clock Source PrescalerWatchdog Timer Watchdog Timer Watchdog Timer Dual Data Pointers Software ResetAUXR1 MOVXA, @DPTR MOVCA, @A+DPTRMOVX@DPTR, a Features Using Flash as data storageGeneral description Introduction to IAP-LiteFlash Program Memory Fmcon Accessing additional flash elements C-language routine to erase/program all or part of aReading additional flash elements Erase-programming additional flash elementsUCFG1 Fmadrl User Configuration Bytes C-language routine to read a flash elementUCFG1 P89LPC901User Security Bytes SECxP89LPC901/902/903 Boot Vector Boot StatusBootvec BootstatArithmetic LogicalMnemonic Description Bytes Cycles Hex Code Data TransferBoolean BranchingReti B8-BFD8-DF MiscellaneousRevision History 108 Index Dual Data Pointers Port 0 12, 14 SFR 113 P89LPC901/902/903

P89LPC903, P89LPC902, P89LPC901 specifications

The Philips P89LPC901, P89LPC902, and P89LPC903 are a series of 8-bit microcontrollers designed for embedded system applications. These models, which belong to the LPC900 series, are notable for their affordability and versatility, making them an attractive choice for both hobbyists and professional developers.

One of the core features of the P89LPC901, P89LPC902, and P89LPC903 microcontrollers is their powerful 8-bit architecture. Operating at clock speeds up to 20 MHz, they deliver efficient performance suited for a range of tasks. Each model includes a comprehensive instruction set that supports various data manipulation and arithmetic functions, enabling extensive programming capabilities.

These microcontrollers come with built-in memory, with configurations that vary among the three models. The P89LPC901 typically features 4 KB of Flash memory and 256 bytes of RAM, while the P89LPC902 and P89LPC903 offer enhanced memory options. This Flash memory allows for reprogrammability, making it easier to update and modify applications as needed.

Another significant characteristic of the LPC900 series is their integrated peripherals. These models are equipped with a variety of I/O ports, allowing for easy interfacing with other devices and components. The P89LPC901 supports up to 32 I/O pins, while the P89LPC902 and P89LPC903 provide additional features such as analog-to-digital converters (ADCs), timers, and serial communication interfaces. This broad range of peripherals empowers developers to design complex applications without needing extra hardware.

Power consumption is also a key consideration for microcontroller applications. The P89LPC901, P89LPC902, and P89LPC903 are designed with low power consumption in mind, making them ideal for battery-operated devices and energy-efficient projects. They can operate in various power modes, allowing for greater flexibility in deployment.

In terms of technology, these microcontrollers utilize advanced CMOS technology, ensuring high reliability and durability. Their design offers a robust solution for numerous applications, including consumer electronics, industrial controls, and automation systems.

In summary, the Philips P89LPC901, P89LPC902, and P89LPC903 microcontrollers present an attractive combination of performance, integrated peripherals, low power consumption, and versatility. Their features cater to a wide array of applications, keeping them relevant in a rapidly evolving technology landscape. For hobbyists and professionals alike, these microcontrollers represent a reliable foundation for embedded system development.
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