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LPC2917 数据表(PDF) 26 Page - NXP Semiconductors |
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LPC2917 数据表(HTML) 26 Page - NXP Semiconductors |
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26 / 68 page  LPC2917_19_1 © NXP B.V. 2007. All rights reserved. Preliminary data sheet Rev. 1.01 — 15 November 2007 26 of 68 NXP Semiconductors LPC2917/19 ARM9 microcontroller with CAN and LIN 8.4.3.4 Timer clock description The timer modules are clocked by two different clocks; CLK_SYS_PESS and CLK_TMRx (x = 0-3), see Section 7.2.2. Note that each timer has its own CLK_TMRx branch clock for power management. The frequency of all these clocks is identical as they are derived from the same base clock BASE_CLK_TMR. The register interface towards the system bus is clocked by CLK_SYS_PESS. The timer and prescale counters are clocked by CLK_TMRx. 8.4.4 UARTs 8.4.4.1 Overview The LPC2917/19 contains two identical UARTs located at different peripheral base addresses. The key features are: • 16-byte receive and transmit FIFOs • Registers conform to industry standard 550 • Receiver FIFO trigger points at 1 byte, 4 bytes, 8 bytes and 14 bytes • Built-in baud-rate generator 8.4.4.2 Description The UART is commonly used to implement a serial interface such as RS232. The LPC2917/19 contains two industry-standard 550 UARTs with 16-byte transmit and receive FIFOs, but they can also be put into 450 mode without FIFOs. 8.4.4.3 UART pin description The two UARTs in the LPC2917/19 have the following pins. The UART pins are combined with other functions on the port pins of the LPC2917/19. Table 15 shows the UART pins (x runs from 0 to 1). Table 14. Timer pins Symbol Direction Description TIMERx CAP[0] IN TIMER x capture input 0 TIMERx CAP[1] IN TIMER x capture input 1 TIMERx CAP[2] IN TIMER x capture input 2 TIMERx CAP[3] IN TIMER x capture input 3 TIMERx MAT[0] OUT TIMER x match output 0 TIMERx MAT[1] OUT TIMER x match output 1 TIMERx MAT[2] OUT TIMER x match output 2 TIMERx MAT[3] OUT TIMER x match output 3 Table 15. UART pins Symbol Direction Description UARTx TXD out UART channel x transmit data output UARTx RXD in UART channel x receive data input |
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