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NXP Semiconductors
Address
0xE000E1C
For more details, refer to DDI0419C_arm_architecture_v6m_reference_manual which
can be found on the ARM webpage.
Example timer calculation
To use the system tick timer, do the following:
The following example illustrates selecting the SysTick timer reload value to obtain a
10 ms time interval with the system clock set to 20 MHz.
Example (system clock = 20 MHz)
The system tick clock = system clock = 20 MHz. Bit CLKSOURCE in the SYST_CSR
register set to 1 (system clock).
RELOAD = (system tick clock frequency * 10 ms) -1 = (20 MHz * 10 ms) -1 = 200000-1=
199999 = 0x00030D3F.
6. PN7462 family Power management
6.1 Power supply
The PN7462 family is using following supply voltages:
• VBUS: Main supply voltage for internal analog modules, digital logic and memories
• VBUSP: Supply voltage for the contact interface
• TVDD_IN: Supply voltage for the contactless interface
• PVDD_IN: Pad voltage reference and supply voltage for the host interfaces (HSUART,
• PVDD_M_IN: Pad voltage reference and supply voltage for the master interfaces (SPI,
• DVDD: Supply voltage for the internal digital blocks
• VUP_TX: External supply voltage for the transmitter LDO (TXLDO)
UM10858
User manual
COMPANY PUBLIC
Name
SYST_CALIB
a. Program the SYST_RVR register with the reload value RELOAD to
obtain the desired time interval.
b. Clear the SYST_CVR register by writing to it. This ensures that the timer
will count from the SYST_RVR value rather than an arbitrary value when
the timer is enabled.
c. Program the SYST_SCR register with the value 0x7 which enables the
SysTick timer and the SysTick timer interrupt.
USB, I2C and SPI) and the GPIOs
I2C)
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
Type
Reset
Description
RW
0x4
System Timer Calibration value
register
314514
UM10858
PN7462 family HW user manual
© NXP B.V. 2018. All rights reserved.
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