Datasheet Archive: P89LPC921FDH,518 datasheet by NXP Semiconductors

P89LPC921FDH,518 datasheet by NXP Semiconductors

Description 8-bit microcontrollers with two-clock 80C51 core 2 kB/4 kB/8 kB 3 V low-power Flash with 256-byte data RAM - ADCs: 2 Analog Comp. ; Clock type: 2-clk ; External interrupt: 3 ; Function: 8-bit 80C51 uController ; I/O pins: 18 ; Memory size: 4K kBits; Memory type: FLASH ; Number of pins: 20 ; Operating frequency: 0~12 MHz; Operating temperature: -40~+85 Cel; Power supply: 2.4~3.6V ; Program security: yes ; PWMs: 2 ch 8-bit res. ; RAM: 256 bytes; Reset active: Low ; Serial interface: UART, I<sup>2</sup>C ; Series: LPC900 family ; Special features: Byte-eraseable Flash, pin-comp. w/ LPC76x, BOD, POR, Int. RC 7.373MHz +-2.5% ; System frequency: 0~12 MHz; Timers: 4 x 16-bit ; Watchdog timer: yes; Package: SOT360-1 (TSSOP20); Container: Reel Dry Pack, SMD, 13"
Datasheet Type Original
RoHS Yes
Pb Free Unknown
Lifecycle Obsolete
Price & Stock
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The maximum clock frequency is 12 MHz, but it can be overclocked up to 18 MHz with some limitations.
The oscillator can be configured using the OSCCFG register. The oscillator frequency can be set to either 12 MHz or 18 MHz, and the oscillator mode can be set to either internal or external.
The watchdog timer is used to reset the microcontroller if it becomes stuck in an infinite loop or if there is a software fault. It can be enabled or disabled using the WDTE bit in the WDTMOD register.
The UART can be used for serial communication. The UART is configured using the UART registers, and the baud rate can be set using the UARTBSEL register. The UART can be used in asynchronous mode or synchronous mode.
The BOD is used to detect when the voltage supply drops below a certain threshold. If the voltage supply drops below the threshold, the microcontroller will reset. The BOD can be enabled or disabled using the BODEN bit in the BODCON register.