M054ZAN Nuvoton Technology Corporation of America, M054ZAN Datasheet - Page 70
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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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
M054ZAN
Manufacturer:
NuvoTon
Quantity:
4 650
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6.2.8
Cortex-M0 provides an interrupt controller as an integral part of the exception mode, named as
“Nested Vectored Interrupt Controller (NVIC)”. It is closely coupled to the processor kernel and
provides following features:
The NVIC prioritizes and handles all supported exceptions. All exceptions are handled in “Handler
Mode”. This NVIC architecture supports 32 (IRQ[31:0]) discrete interrupts with 4 levels of priority.
All of the interrupts and most of the system exceptions can be configured to different priority
levels. When an interrupt occurs, the NVIC will compare the priority of the new interrupt to the
current running one’s priority. If the priority of the new interrupt is higher than the current one, the
new interrupt handler will override the current handler.
When any interrupts is accepted, the starting address of the interrupt service routine (ISR) is
fetched from a vector table in memory. There is no need to determine which interrupt is accepted
and branch to the starting address of the correlated ISR by software. While the starting address is
fetched, NVIC will also automatically save processor state including the registers “PC, PSR, LR,
R0~R3, R12” to the stack. At the end of the ISR, the NVIC will restore the mentioned registers
from stack and resume the normal execution. Thus it will take less and deterministic time to
process the interrupt request.
The NVIC supports “Tail Chaining” which handles back-to-back interrupts efficiently without the
overhead of states saving and restoration and therefore reduces delay time in switching to
pending ISR at the end of current ISR. The NVIC also supports “Late Arrival” which improves the
efficiency of concurrent ISRs. When a higher priority interrupt request occurs before the current
ISR starts to execute (at the stage of state saving and starting address fetching), the NVIC will
give priority to the higher one without delay penalty. Thus it advances the real-time capability.
For more detailed information, please refer to the documents
Reference Manual” and
Nested Vectored Interrupt Controller (NVIC)
Nested and Vectored interrupt support
Automatic processor state saving and restoration
Dynamic priority changing
Reduced and deterministic interrupt latency
NuMicro M051
“ARM
®
v6-M Architecture Reference Manual”.
™
Series Technical Reference Manual
- 70 -
Publication Release Date: Sep 14, 2010
“ARM
®
Cortex™-M0 Technical
Revision V1.2
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