OM13006,598 NXP Semiconductors, OM13006,598 Datasheet - Page 289

• Manufacturer Part Number: OM13006,598
• Description: BOARD EVAL EM773 METER EU PLUG
• Manufacturer: NXP Semiconductors
• Type: Other Power Managementr

Specifications of OM13006,598

• Design Resources: Plug Meter Schematics, Gerber Files USB Dongle Schematics, Gerber Files
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 32-Bit
• Utilized Ic / Part: EM773FHN33,551
• Interface Type: USB
• Maximum Operating Temperature: + 150 C
• Operating Supply Voltage: 1.8 V to 3.6 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EM773, OL2381
• Other names: 568-6681

NXP Semiconductors
UM10415
User manual
20.5.4.2.1 Calculating the RELOAD value
20.5.4.1 SysTick Control and Status Register
20.5.4.2 SysTick Reload Value Register
20.5.4.3 SysTick Current Value Register
The SYST_CSR enables the SysTick features. See the register summary in for its
attributes. The bit assignments are:
Table 256. SYST_CSR bit assignments
The SYST_RVR specifies the start value to load into the SYST_CVR. See the register
summary in
Table 257. 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 20–255
Table 20–255
Name
-
RELOAD
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 September 2010
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.
Remark: The external reference clock option is not implemented.
This bit reads as 1 and writes to this bit are ignored.
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.
Chapter 20: Appendix EM773 ARM Cortex-M0 reference
Section
20.5.4.2.1.
UM10415
© NXP B.V. 2010. All rights reserved.
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