ATSAM3S4CA-CU Atmel, ATSAM3S4CA-CU Datasheet - Page 50

• Manufacturer Part Number: ATSAM3S4CA-CU
• Description: IC MCU 32BIT 256KB FLASH 100BGA
• Manufacturer: Atmel
• Series: SAM3Sr

Specifications of ATSAM3S4CA-CU

• 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-LFBGA
• Processor Series: ATSAM3x
• Core: ARM Cortex M3
• 3rd Party Development Tools: JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: ATSAM3S-EK
• Package: 100LFBGA
• Device Core: ARM Cortex M3
• Family Name: AT91
• Maximum Speed: 64 MHz
• Operating Supply Voltage: 1.8|3.3 V
• Data Bus Width: 32 Bit
• Number Of Programmable I/os: 79
• Interface Type: I2C/I2S/SPI/UART/USART/USB
• On-chip Adc: 16-chx12-bit
• On-chip Dac: 2-chx12-bit
• Number Of Timers: 6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

10.4.3.14
• BASEPRI
Priority mask bits:
0x0000 = no effect
Nonzero = defines the base priority for exception processing.
The processor does not process any exception with a priority value greater than or equal to BASEPRI.
This field is similar to the priority fields in the interrupt priority registers. The processor implements only bits[7:4] of this field,
bits[3:0] read as zero and ignore writes. See
that higher priority field values correspond to lower exception priorities.
50
31
23
15
7
SAM3S Preliminary
Base Priority Mask Register
30
22
14
6
The BASEPRI register defines the minimum priority for exception processing. When BASEPRI is
set to a nonzero value, it prevents the activation of all exceptions with same or lower priority
level as the BASEPRI value. See the register summary in
butes. The bit assignments are:
29
21
13
5
“Interrupt Priority Registers” on page 158
28
20
12
4
Reserved
Reserved
Reserved
BASEPRI
27
19
11
3
26
18
10
2
Table 10-2 on page 44
for more information. Remember
25
17
9
1
6500C–ATARM–8-Feb-11
for its attri-
24
16
8
0