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參數(shù)資料
| 型號： | LPC2220 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 16/32-bit ARM microcontrollers; flashless with 64 kB, with 10-bit ADC and external memory interface |
| 中文描述： | 16/32位 ARM微控制器；64KB的閃存；10位模數(shù)轉(zhuǎn)換和外部存儲器接口 |
| 文件頁數(shù)： | 28/49頁 |
| 文件大?。?/td> | 255K |
| 代理商： | LPC2220 |
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9397 750 14061
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02— 30 May 2005
28 of 49
Philips Semiconductors
LPC2210/2220
16/32-bit ARM microcontrollers with external memory interface
6.20.3
Reset and wake-up timer
Reset has two sources on the LPC2210/2220: the RESET pin and watchdog reset. The
RESET pin is a Schmitt trigger input pin with an additional glitch filter. Assertion of chip
Reset by any source starts the wake-up timer (see wake-up timer description below),
causing the internal chip reset to remain asserted until the external Reset is de-asserted,
the oscillator is running, a fixed number of clocks have passed, and the on-chip circuitry
has completed its initialization.
When the internal Reset is removed, the processor begins executing at address 0, which
is the Reset vector. At that point, all of the processor and peripheral registers have been
initialized to predetermined values.
The wake-up timer ensures that the oscillator and other analog functions required for chip
operation are fully functional before the processor is allowed to execute instructions. This
is important at power on, all types of Reset, and whenever any of the aforementioned
functions are turned off for any reason. Since the oscillator and other functions are turned
off during Power-down mode, any wake-up of the processor from Power-down mode
makes use of the wake-up timer.
The wake-up timer monitors the crystal oscillator as the means of checking whether it is
safe to begin code execution. When power is applied to the chip, or some event caused
the chip to exit Power-down mode, some time is required for the oscillator to produce a
signal of sufficient amplitude to drive the clock logic. The amount of time depends on
many factors, including the rate of V
DD
ramp (in the case of power on), the type of crystal
and its electrical characteristics (if a quartz crystal is used), as well as any other external
circuitry (e.g. capacitors), and the characteristics of the oscillator itself under the existing
ambient conditions.
6.20.4
External interrupt inputs
The LPC2210/2220 includes up to nine edge or level sensitive External Interrupt Inputs as
selectable pin functions. When the pins are combined, external events can be processed
as four independent interrupt signals. The External Interrupt Inputs can optionally be used
to wake up the processor from Power-down mode.
6.20.5
Memory mapping control
The Memory Mapping Control alters the mapping of the interrupt vectors that appear
beginning at address 0x0000 0000. Vectors may be mapped to the bottom of the BANK0
external memory, or to the on-chip static RAM. This allows code running in different
memory spaces to have control of the interrupts.
6.20.6
Power control
The LPC2210/2220 supports two reduced power modes: Idle mode and Power-down
mode.
In Idle mode, execution of instructions is suspended until either a reset or interrupt occurs.
Peripheral functions continue operation during Idle mode and may generate interrupts to
cause the processor to resume execution. Idle mode eliminates power used by the
processor itself, memory systems and related controllers, and internal buses.
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| LPC2220FBD144,551-CUT TAPE | 制造商:NXP 功能描述:LPC2220 Series 16 kB 60 MHz 16/32-Bit Flashless ARM Microcontroller - LQFP-144 |
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