LPC2114 查看數據表（PDF） - Philips Electronics

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LPC2114

Single-chip 16/32-bit microcontrollers; 128/256 kB ISP/IAP Flash with 10-bit ADC

Philips Electronics 

Philips Semiconductors

LPC2114/LPC2124

Single-chip 16/32-bit microcontrollers

Three match registers can be used to provide a PWM output with both edges

controlled. Again, the MR0 match register controls the PWM cycle rate. The other

match registers control the two PWM edge positions. Additional double edge

controlled PWM outputs require only two match registers each, since the repetition

rate is the same for all PWM outputs.

With double edge controlled PWM outputs, specific match registers control the rising

and falling edge of the output. This allows both positive going PWM pulses (when the

rising edge occurs prior to the falling edge), and negative going PWM pulses (when

the falling edge occurs prior to the rising edge).

6.18.1 Features

• Seven match registers allow up to six single edge controlled or three double edge

controlled PWM outputs, or a mix of both types.

• The match registers also 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.

• Supports single edge controlled and/or double edge controlled PWM outputs.

Single edge controlled PWM outputs all go HIGH at the beginning of each cycle

unless the output is a constant LOW. Double edge controlled PWM outputs can

have either edge occur at any position within a cycle. This allows for both positive

going and negative going pulses.

• Pulse period and width can be any number of timer counts. This allows complete

flexibility in the trade-off between resolution and repetition rate. All PWM outputs

will occur at the same repetition rate.

• Double edge controlled PWM outputs can be programmed to be either positive

going or negative going pulses.

• Match register updates are synchronized with pulse outputs to prevent generation

of erroneous pulses. Software must ‘release’ new match values before they can

become effective.

• May be used as a standard timer if the PWM mode is not enabled.

• A 32-bit Timer/Counter with a programmable 32-bit Prescaler.

6.19 System control

6.19.1 Crystal oscillator

The oscillator supports crystals in the range of 1 MHz to 30 MHz. The oscillator

output frequency is called fosc and the ARM processor clock frequency is referred to

as cclk for purposes of rate equations, etc. fosc and cclk are the same value unless

the PLL is running and connected. Refer to Section 6.19.2 “PLL” for additional

information.

9397 750 13145

Product data

Rev. 03 — 22 December 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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