LPC2104 Philips Semiconductors (Acquired by NXP), LPC2104 Datasheet - Page 18

• Manufacturer Part Number: LPC2104
• Description: LPC2104/2105/2106; Single-chip 32-bit Microcontrollers; 128 KB Isp/iap Flash With 64 KB/32 KB/16 KB RAM;; Package: SOT313-2 (LQFP48)
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
9397 750 11499
Product data
6.14.1 Features
6.15.1 Features
6.15 Real time clock
6.16 Pulse width modulator
The Real Time Clock (RTC) is designed to provide a set of counters to measure time
during system power on and off operation. 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).
The PWM is based on the standard Timer block and inherits all of its features,
although only the PWM function is pinned out on the LPC2104, LPC2105 and
LPC2106. The Timer is designed to count cycles of the peripheral clock (PCLK) and
optionally generate interrupts or perform other actions when specified timer values
occur, based on seven match registers. It also includes four capture inputs to save the
timer value when an input signal transitions, and optionally generate an interrupt
when those events occur. The PWM function is in addition to these features, and is
based on match register events.
The ability to separately control rising and falling edge locations allows the PWM to
be used for more applications. For instance, multi-phase motor control typically
requires three non-overlapping PWM outputs with individual control of all three pulse
widths and positions.
Two match registers can be used to provide a single edge controlled PWM output.
One match register (MR0) controls the PWM cycle rate, by resetting the count upon
match. The other match register controls the PWM edge position. Additional single
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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
t
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.
pclk
4.
Rev. 02 — 11 June 2003
pclk
256
LPC2104/2105/2106
4) to (t
Single-chip 32-bit microcontrollers
pclk
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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32
4) in multiples of
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