lpc2917 NXP Semiconductors, lpc2917 Datasheet - Page 26

• Manufacturer Part Number: lpc2917
• Description: Arm9 Microcontroller With Can And Lin
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2917_19_1
Preliminary data sheet
8.4.3.4 Timer clock description
8.4.4.1 Overview
8.4.4.2 Description
8.4.4.3 UART pin description
8.4.4 UARTs
Table 14.
The timer modules are clocked by two different clocks; CLK_SYS_PESS and CLK_TMRx
(x = 0-3), see
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.
The LPC2917/19 contains two identical UARTs located at different peripheral base
addresses. The key features are:
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.
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.
runs from 0 to 1).
Table 15.
Symbol
TIMERx CAP[0]
TIMERx CAP[1]
TIMERx CAP[2]
TIMERx CAP[3]
TIMERx MAT[0]
TIMERx MAT[1]
TIMERx MAT[2]
TIMERx MAT[3]
Symbol
UARTx TXD
UARTx RXD
•
•
•
•
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
Timer pins
UART pins
Section
Direction
out
in
OUT
OUT
OUT
OUT
Direction
IN
IN
IN
IN
Rev. 1.01 — 15 November 2007
7.2.2. Note that each timer has its own CLK_TMRx branch clock for
Description
UART channel x transmit data output
UART channel x receive data input
TIMER x match output 0
TIMER x match output 1
TIMER x match output 2
TIMER x match output 3
Description
TIMER x capture input 0
TIMER x capture input 1
TIMER x capture input 2
TIMER x capture input 3
ARM9 microcontroller with CAN and LIN
Table 15
LPC2917/19
shows the UART pins (x
© NXP B.V. 2007. All rights reserved.
26 of 68