LPC1111FHN33/102'5 NXP Semiconductors, LPC1111FHN33/102'5 Datasheet - Page 508

• Manufacturer Part Number: LPC1111FHN33/102'5
• Description: ARM Microcontrollers - MCU CORTEX-M0 8 KB FL 4 KB SRAM
• Manufacturer: NXP Semiconductors

Specifications of LPC1111FHN33/102'5

• Rohs: yes
• Core: ARM Cortex M0
• Processor Series: LPC1111
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 50 MHz
• On-chip Adc: Yes
• Operating Supply Voltage: 1.8 V to 3.6 V
• Operating Temperature Range: - 65 C to + 150 C
• Mounting Style: SMD/SMT
• Interface Type: I2C, SPI, UART
• Number Of Programmable I/os: 42
• Number Of Timers: 4
• Program Memory Type: Flash
• Factory Pack Quantity: 4000

NXP Semiconductors
UM10398
User manual
28.6.4.2.1 Calculating the RELOAD value
28.6.4.1 SysTick Control and Status Register
28.6.4.2 SysTick Reload Value Register
28.6.4.3 SysTick Current Value Register
The SYST_CSR enables the SysTick features. See the register summary in for its
attributes. The bit assignments are:
Table 458. SYST_CSR bit assignments
The SYST_RVR specifies the start value to load into the SYST_CVR. See the register
summary in
Table 459. SYST_RVR bit assignments
The RELOAD value can be any value in the range 0x00000001-0x00FFFFFF. You can program
a value of 0, but this has no effect because the SysTick exception request and
COUNTFLAG are activated when counting from 1 to 0.
To generate a multi-shot timer with a period of N processor clock cycles, use a RELOAD
value of N-1. For example, if the SysTick interrupt is required every 100 clock pulses, set
RELOAD to 99.
The SYST_CVR contains the current value of the SysTick counter. See the register
summary in
Bits
[31:17]
[16]
[15:3]
[2]
[1]
[0]
Bits
[31:24]
[23:0]
Name
-
COUNTFLAG
-
CLKSOURCE
TICKINT
ENABLE
Table 28–457
Table 28–457
-
Name
RELOAD
Chapter 28: LPC111x/LPC11Cxx Appendix: ARM Cortex-M0 reference
All information provided in this document is subject to legal disclaimers.
Rev. 12 — 24 September 2012
Function
Reserved.
Value to load into the SYST_CVR when the counter is enabled and
when it reaches 0, see
for its attributes. The bit assignments are:
for its attributes. The bit assignments are:
Function
Reserved.
Returns 1 if timer counted to 0 since the last read of this register.
Reserved.
Selects the SysTick timer clock source:
0 = external reference clock.
1 = processor clock.
Enables SysTick exception request:
0 = counting down to zero does not assert the SysTick exception
request.
1 = counting down to zero asserts the SysTick exception request.
Enables the counter:
0 = counter disabled.
1 = counter enabled.
Section
28.6.4.2.1.
UM10398
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