- NXP ARM Microcontroller Product Data Sheet
Table Of Contents
- 1. Introduction
- 2. General description
- 3. Features
- 4. Ordering information
- 5. Block diagram
- 6. Pinning information
- 7. Functional description
- 8. Block description
- 9. Limiting values
- 10. Thermal characteristics
- 11. Static characteristics
- 12. Dynamic characteristics
- 13. Package outline
- 14. Soldering
- 15. Abbreviations
- 16. References
- 17. Revision history
- 18. Legal information
- 19. Contact information
- 20. Contents
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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