LPC2148(2007) 데이터 시트보기 (PDF) - NXP Semiconductors.

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LPC2148
(Rev.:2007)

Single-chip 16-bit/32-bit microcontrollers; up to 512 kB flash with ISP/IAP, USB 2.0 full-speed device, 10-bit ADC and DAC

NXP Semiconductors. 

NXP Semiconductors

LPC2141/42/44/46/48

Single-chip 16-bit/32-bit microcontrollers

6.15.1 Features

• A 32-bit timer/counter with a programmable 32-bit prescaler

• External event counter or timer operation

• Four 32-bit capture channels per timer/counter that can take a snapshot of the timer

value when an input signal transitions, a capture event may also optionally generate

an interrupt

• Four 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

• Four external outputs per timer/counter corresponding to match registers, with the

following capabilities:

– Set LOW on match

– Set HIGH on match

– Toggle on match

– Do nothing on match

6.16 Watchdog timer

The purpose of the watchdog is to reset the microcontroller within a reasonable amount of

time if it enters an erroneous state. When enabled, the watchdog will generate a system

reset if the user program fails to ‘feed’ (or reload) the watchdog within a predetermined

amount of time.

6.16.1 Features

• Internally resets chip if not periodically reloaded

• Debug mode

• Enabled by software but requires a hardware reset or a watchdog reset/interrupt to be

disabled

• Incorrect/Incomplete feed sequence causes reset/interrupt if enabled

• Flag to indicate watchdog reset

• Programmable 32-bit timer with internal pre-scaler

• Selectable time period from (Tcy(PCLK) × 256 × 4) to (Tcy(PCLK) × 232 × 4) in multiples of

Tcy(PCLK) × 4

6.17 Real-time clock

The RTC is designed to provide a set of counters to measure time when normal or idle

operating mode is selected. The RTC has been designed to use little power, making it

suitable for battery powered systems where the CPU is not running continuously (Idle

mode).

6.17.1 Features

• Measures the passage of time to maintain a calendar and clock

LPC2141_42_44_46_48_3

Product data sheet

Rev. 03 — 19 October 2007

© NXP B.V. 2007. All rights reserved.

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