M054ZAN Nuvoton Technology Corporation of America, M054ZAN Datasheet - Page 66
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M054ZAN
Manufacturer Part Number
M054ZAN
Description
IC MCU 32BIT 16KB FLASH 33QFN
Manufacturer
Nuvoton Technology Corporation of America
Series
NuMicro M051™r
Specifications of M054ZAN
Core Processor
ARM Cortex-M0
Core Size
32-Bit
Speed
50MHz
Connectivity
I²C, IrDA, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
24
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 5.5 V
Data Converters
A/D 5x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
33-WFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
M054ZAN
Manufacturer:
NuvoTon
Quantity:
4 650
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™
NuMicro M051
Series Technical Reference Manual
6.2.7
System Timer (SysTick)
The Cortex-M0 includes an integrated system timer, SysTick. SysTick provides a simple, 24-bit
clear-on-write, decrementing, wrap-on-zero counter with a flexible control mechanism. The
counter can be used as a Real Time Operating System (RTOS) tick timer or as a simple counter.
When system timer is enabled, it will count down from the value in the SysTick Current Value
Register (SYST_CVR) to zero, and reload (wrap) to the value in the SysTick Reload Value
Register (SYST_RVR) on the next clock edge, then decrement on subsequent clocks. When the
counter transitions to zero, the COUNTFLAG status bit is set. The COUNTFLAG bit clears on
reads.
The SYST_CVR value is UNKNOWN on reset. Software should write to the register to clear it to
zero before enabling the feature. This ensures the timer will count from the SYST_RVR value
rather than an arbitrary value when it is enabled.
If the SYST_RVR is zero, the timer will be maintained with a current value of zero after it is
reloaded with this value. This mechanism can be used to disable the feature independently from
the timer enable bit.
For more detailed information, please refer to the documents “ARM® Cortex™-M0 Technical
Reference Manual” and “ARM® v6-M Architecture Reference Manual”.
Publication Release Date: Sep 14, 2010
- 66 -
Revision V1.2
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