LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 508
LPC1767FBD100,551
Manufacturer Part Number
LPC1767FBD100,551
Description
IC ARM CORTEX MCU 512K 100-LQFP
Manufacturer
NXP Semiconductors
Series
LPC17xxr
Datasheets
1.LPC1767FBD100551.pdf
(2 pages)
2.LPC1767FBD100551.pdf
(840 pages)
3.LPC1767FBD100551.pdf
(65 pages)
Specifications of LPC1767FBD100,551
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
100MHz
Connectivity
Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
Peripherals
Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
Number Of I /o
70
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Ram Size
64K x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 3.6 V
Data Converters
A/D 8x12b, D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-LQFP
Processor Series
LPC17
Core
ARM Cortex M3
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2, MCB1760, MCB1760U, MCB1760UME
For Use With
622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Other names
568-4967
935289808551
935289808551
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC1767FBD100,551
Manufacturer:
NXP Semiconductors
Quantity:
10 000
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NXP Semiconductors
23.6 Example timer calculations
UM10360
User manual
The following examples illustrate selecting System Tick Timer values for different system
configurations. All of the examples calculate an interrupt interval of 10 milliseconds, as the
System Tick Timer is intended to be used.
Example 1)
This example is for the System Tick Timer running from the CPU clock (cclk), which is
100 MHz.
STCTRL = 7. This enables the timer and its interrupt, and selects cclk as the clock source.
RELOAD = (cclk / 100) - 1 = 1,000,000 - 1 = 999,999 = 0xF423F
In this case, there is no rounding error, so the result is as accurate as cclk.
Example 2)
This example is for the System Tick Timer running from the CPU clock (cclk), which is
80 MHz.
STCTRL = 7. This enables the timer and its interrupt, and selects cclk as the clock source.
RELOAD = (cclk / 100) - 1 = 800,000 - 1 = 799,999 = 0xC34FF
In this case, there is no rounding error, so the result is as accurate as cclk.
Example 3)
This example is for the CPU clock (cclk) is taken from the Internal RC Oscillator (IRC),
factory trimmed to 4 MHz.
STCTRL = 7. This enables the timer and its interrupt, and selects cclk as the clock source.
RELOAD = (F
In this case, there is no rounding error, so the result is as accurate as the IRC.
Example 4)
This example is for the System Tick Timer running from an external clock source (the
STCLK pin), which in this case happens to be 32.768 kHz.
STCTRL = 3. This enables the timer and its interrupt, and selects the STCLK pin as the
clock source. STCLK must be selected as the function of the relevant pin. See
Section
RELOAD = (cclk / 100) - 1 = 327.6 - 1 = 327 (rounded up) = 0x0147
In this case, there is rounding error, so the interrupt rate will drift slightly relative to the
input frequency.
8.5.6.
IRC
All information provided in this document is subject to legal disclaimers.
/ 100) - 1 = 40,000 - 1 = 39,999 = 0x9C3F
Rev. 2 — 19 August 2010
Chapter 23: LPC17xx System Tick Timer
UM10360
© NXP B.V. 2010. All rights reserved.
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