ATSAM3S4CA-AU Atmel, ATSAM3S4CA-AU Datasheet - Page 162
ATSAM3S4CA-AU
Manufacturer Part Number
ATSAM3S4CA-AU
Description
IC MCU 32BIT 256KB FLASH 100LQFP
Manufacturer
Atmel
Series
SAM3Sr
Specifications of ATSAM3S4CA-AU
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
64MHz
Connectivity
EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
Number Of I /o
79
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
48K x 8
Voltage - Supply (vcc/vdd)
1.62 V ~ 1.95 V
Data Converters
A/D 16x10/12b, D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-LQFP
Controller Family/series
ATSAM3S
No. Of I/o's
79
Ram Memory Size
48KB
Cpu Speed
64MHz
No. Of Timers
6
Rohs Compliant
Yes
Processor Series
ATSAM3x
Core
ARM Cortex M3
3rd Party Development Tools
JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
ATSAM3S-EK
Cpu Family
AT91
Device Core
ARM Cortex-M3
Device Core Size
32b
Frequency (max)
64MHz
Total Internal Ram Size
48KB
# I/os (max)
79
Number Of Timers - General Purpose
6
Operating Supply Voltage (typ)
1.8/3.3V
Operating Supply Voltage (max)
1.95/3.6V
Operating Supply Voltage (min)
1.62V
On-chip Adc
16-chx12-bit
On-chip Dac
2-chx12-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
100
Package Type
LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATSAM3S4CA-AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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10.20.9
10.20.9.1
162
SAM3S Preliminary
Level-sensitive interrupts
Hardware and software control of interrupts
The processor supports level-sensitive interrupts.
A level-sensitive interrupt is held asserted until the peripheral deasserts the interrupt signal. Typ-
ically this happens because the ISR accesses the peripheral, causing it to clear the interrupt
request.
When the processor enters the ISR, it automatically removes the pending state from the inter-
rupt, see
signal is not deasserted before the processor returns from the ISR, the interrupt becomes pend-
ing again, and the processor must execute its ISR again. This means that the peripheral can
hold the interrupt signal asserted until it no longer needs servicing.
The Cortex-M3 latches all interrupts. A peripheral interrupt becomes pending for one of the fol-
lowing reasons:
A pending interrupt remains pending until one of the following:
The processor enters the ISR for the interrupt. This changes the state of the interrupt from pend-
ing to active. Then:
For a level-sensitive interrupt, if the interrupt signal is still asserted, the state of the interrupt
does not change. Otherwise, the state of the interrupt changes to inactive.
• the NVIC detects that the interrupt signal is HIGH and the interrupt is not active
• the NVIC detects a rising edge on the interrupt signal
• software writes to the corresponding interrupt set-pending register bit, see
• Software writes to the corresponding interrupt clear-pending register bit.
pending Registers” on page
Trigger Interrupt Register” on page
– For a level-sensitive interrupt, when the processor returns from the ISR, the NVIC
– If the interrupt signal is not pulsed while the processor is in the ISR, when the
samples the interrupt signal. If the signal is asserted, the state of the interrupt
changes to pending, which might cause the processor to immediately re-enter the
ISR. Otherwise, the state of the interrupt changes to inactive.
processor returns from the ISR the state of the interrupt changes to inactive.
“Hardware and software control of interrupts”
155, or to the STIR to make an SGI pending, see
161.
. For a level-sensitive interrupt, if the
6500C–ATARM–8-Feb-11
“Interrupt Set-
“Software
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