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M054LAN Datasheet(PDF) 21 Page - Nuvotem Talema

Part No. M054LAN
Description  ARM Cortex™-M0 32-BIT MICROCONTROLLER
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Maker  TALEMA [Nuvotem Talema]
Homepage  http://www.nuvotem.com
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M054LAN Datasheet(HTML) 21 Page - Nuvotem Talema

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M052/M054 Data Sheet
Publication Release Date: Mar 15, 2011
- 21 -
Revision V1.0
5V to 2.5V
LDO
PLL
12-bit
SAR-ADC
Brown Out Detector
POR50
POR25
Low Voltage
Reset
FLASH
Digital Logic
(Timer/UART/I2C/SPI…)
2.5V
IRC
22.1184MHz
& 10KHz Osc.
AVDD
AVSS
LDO_CAP
10uF
IO cell
P0~P4
NuMicro-M051 Power Architecture
Figure 6–2 NuMicro M051
Series Power Architecture Diagram
6.2.4
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


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