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MSP430P337AIPJM Datasheet(PDF) 10 Page - Texas Instruments |
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MSP430P337AIPJM Datasheet(HTML) 10 Page - Texas Instruments |
10 / 41 page MSP430C33x, MSP430P337A MIXED SIGNAL MICROCONTROLLERS SLAS227A – OCTOBER 1999 – REVISED JUNE 2000 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 ROM memory organization Int. Vector 24 kB ROM 1024B RAM 16b Per. 8b Per. SFR FFFFh FFE0h FFDFh A000h 05FFh 0200h 01FFh 0100h 00FFh 0010h 000Fh 0000h MSP430C336 Int. Vector 32 kB ROM 1024B RAM 16b Per. 8b Per. SFR FFFFh FFE0h FFDFh 8000h 05FFh 0200h 01FFh 0100h 00FFh 0010h 000Fh 0000h MSP430C337 Int. Vector 32 kB OTP or EPROM 1024B RAM 16b Per. 8b Per. SFR FFFFh FFE0h FFDFh 8000h 05FFh 0200h 01FFh 0100h 00FFh 0010h 000Fh 0000h MSP430P337A PMS430E337A peripherals Peripherals that are connected to the CPU through a data, address, and controls bus can be handled easily with instructions for memory manipulation. oscillator and system clock Two clocks are used in the system: the system (master) clock (MCLK) and the auxiliary clock (ACLK). The MCLK is a multiple of the ACLK. The ACLK runs with the crystal oscillator frequency. The special design of the oscillator supports the feature of low current consumption and the use of a 32 768 Hz crystal. The crystal is connected across two terminals without any other external components required. The oscillator starts after applying VCC, due to a reset of the control bit (OscOff) in the status register (SR). It can be stopped by setting the OscOff bit to a 1. The enabled clock signals ACLK, ACLK/2, ACLK/4, or MCLK are accessible for use by external devices at output terminal XBUF. The controller system clocks have to deal with different requirements according to the application and system condition. Requirements include: D High frequency in order to react quickly to system hardware requests or events D Low frequency in order to minimize current consumption, EMI, etc. D Stable frequency for timer applications e.g., real-time clock (RTC) D Enable start-stop operation with minimum delay to operation function These requirements cannot all be met with fast frequency high-Q crystals or with RC-type low-Q oscillators. This compromise and selected for the MSP430, uses a low-crystal frequency, which is multiplied to achieve the desired nominal operating range: f (system) + (N ) 1) f ( crystal) |
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