Nxp Semiconductors LPC2194HBD64,151 ARM7 Microcontroller 16kB LQFP 64 LPC2194HBD64,151 数据表

LPC2194_4

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.

Four external outputs per timer corresponding to match registers, with the following 
capabilities:

– Set LOW on match.

– Set HIGH on match.

– Toggle on match.

– Do nothing on match.

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.

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 (T

cy(PCLK)

× 256 × 4) to (T

cy(PCLK)

× 2

32

× 4) in multiples of 

T

cy(PCLK)

× 4.

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).

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

Ultra low power design to support battery powered systems.

Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and 
Day of Year.

Programmable reference clock divider allows adjustment of the RTC to match various 
crystal frequencies.