LPC802 datasheet(29/83 Pages) NXP

29 / 83 page

LPC802

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Product data sheet

Rev. 1.6 — 27 April 2018

29 of 83

NXP Semiconductors

LPC802

32-bit ARM Cortex-M0+ microcontroller

Fig 14. LPC802 WKT clocking

WKT

SYSCON

system clock

SYSAHBCLKCTRL

(WKT clock enable)

FRO

PDRUNCFG

(enable FRO and FRO output

FRO_PD, FROOUT_PD)

LPOSC

PDRUNCFG

WKT registers

12 MHz

32-bit counter

COUNT

CLKSEL

SET_EXTCLK

WKTCLKIN

CTRL

div

750 kHz

1 MHz

aaa-028308

Fig 15. LPC802 FRO subsystem

set_fro_frequency() API

FRO OSCILLATOR

30/24/18 MHz

15/12/9 MHz

(default = 12 MHz)

(default = 24 MHz)

aaa-028307

Divide by 2

fro

Divide by 2

fro_div

Table 6.

Clocking diagram signal name descriptions

Name

Description

clk_in

The internal clock that comes from the main CLK_IN pin function. That function must be connected to the

pin by selecting it in the SWM block.

frg_clk

The output of the Fractional Rate Generator. The FRG and its source selection are shown in Figure 13.

fro_div

Divided output of the currently selected on-chip FRO oscillator. See Figure 15.

fro

The output of the currently selected on-chip FRO oscillator. See Figure 15.

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