LPC3240 datasheet(40/73 Pages) NXP

40 / 73 page

LPC3220_30_40_50_1

Preliminary data sheet

Rev. 01 — 6 February 2009

40 of 73

NXP Semiconductors

LPC3220/30/40/50

16/32-bit ARM microcontrollers

– set LOW on match

– set HIGH on match

– toggle on match

– do nothing on match

7.9.6 High-speed timer

The high-speed timer block is clocked by the main peripheral clock. The clock is ﬁrst

divided down in a 16-bit programmable pre-scale counter which clocks a 32-bit

timer/counter.

The high-speed timer includes three match registers that are compared to the

timer/counter value. A match can generate an interrupt and cause the timer/counter to

either continue to run, stop, or be reset. The high-speed timer also includes two capture

registers that can take a snapshot of the timer/counter value when an input signal

transitions. A capture event may also generate an interrupt.

7.9.6.1

Features

• 32-bit timer/counter with programmable 16-bit pre-scaler.

• Counter or timer operation.

• Two 32-bit capture registers.

• Three 32-bit match registers that allow:

– Continuous operation with optional interrupt generation on match.

– Stop timer on match with optional interrupt generation.

– Reset timer on match with optional interrupt generation.

• Pause control to stop counting when core is in debug state.

7.9.7 Pulse Width Modulators (PWMs)

The LPC3220/30/40/50 provides two simple PWMs. They are clocked separately by either

the main peripheral clock or the 32 kHz RTC clock. Both PWMs have a duty cycle

programmable in 255 steps.

7.9.7.1

Features

• Clocked by the main peripheral clock or the 32 kHz RTC clock.

• Programmable 4-bit pre-scaler.

• Duty cycle programmable in 255 steps.

• Output frequency up to 50 kHz when using a 13 MHz peripheral clock.

7.9.8 Motor control pulse width modulator

The Motor Control PWM (MCPWM) provides a set of features for three-phase AC and DC

motor control applications in a single peripheral. The MCPWM can also be conﬁgured for

use in other generalized timing, counting, capture, and compare applications.

7.9.8.1

Features

• 32-bit timer

• 32-bit period register

LPC3240 Datasheet(PDF) 40 Page - NXP Semiconductors

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