LPC2939 datasheet(21/99 Pages) NXP

21 / 99 page

LPC2939_3

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Product data sheet

Rev. 03 — 7 April 2010

21 of 99

NXP Semiconductors

LPC2939

ARM9 microcontroller with CAN, LIN, and USB

[1]

This clock is always on (cannot be switched off for system safety reasons).

[2]

In the peripheral subsystem parts of the Timers, watchdog timer, SPI and UART have their own clock

source. See Section 6.13 for details.

[3]

In the Power Clock and Reset Control subsystem parts of the CGU, RGU, and PMU have their own clock

source. See Section 6.16 for details.

[4]

The clock should remain activated when system wake-up on timer or UART is required.

BASE_MSCSS_CLK

CLK_MSCSS_APB

APB side of the MSCSS

CLK_MSCSS_MTMR0

timer 0 in the MSCSS

CLK_MSCSS_MTMR1

timer 1 in the MSCSS

CLK_MSCSS_PWM0

PWM 0

CLK_MSCSS_PWM1

PWM 1

CLK_MSCSS_PWM2

PWM 2

CLK_MSCSS_PWM3

PWM 3

CLK_MSCSS_ADC0_APB APB side of ADC 0

CLK_MSCSS_ADC1_APB APB side of ADC 1

CLK_MSCSS_ADC2_APB APB side of ADC 2

CLK_MSCSS_QEI

Quadrature Encoder Interface (QEI)

BASE_UART_CLK

CLK_UART0

UART 0 interface clock

CLK_UART1

UART 1 interface clock

BASE_ICLK0_CLK

CGU1 input clock

BASE_SPI_CLK

CLK_SPI0

SPI 0 interface clock

CLK_SPI1

SPI 1 interface clock

CLK_SPI2

SPI 2 interface clock

BASE_TMR_CLK

CLK_TMR0

timer 0 clock for counter part

CLK_TMR1

timer 1 clock for counter part

CLK_TMR2

timer 2 clock for counter part

CLK_TMR3

timer 3 clock for counter part

BASE_ADC_CLK

CLK_ADC0

control of ADC 0, capture sample

result

CLK_ADC1

control of ADC 1, capture sample

result

CLK_ADC2

control of ADC 2, capture sample

result

reserved

BASE_ICLK1_CLK

CGU1 input clock

Table 8.

CGU1 base clock and branch clock overview

Base clock

Branch clock name

Parts of the device clocked by this

branch clock

BASE_OUT_CLK

CLK_OUT_CLK

pin CLK_OUT

BASE_USB_CLK

CLK_USB_CLK

USB clock

BASE_USB_I2C_CLK

CLK_USB_I2C_CLK

USB OTG I2C clock

Table 7.

CGU0 base clock and branch clock overview …continued

Base clock

Branch clock name

Parts of the device clocked by this

branch clock

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