AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 143

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

21. SAM7 Boot Program
21.1
21.2
Description
The Boot Program integrates different programs permitting download and/or upload into the different memories of
the product.
First, it initializes the Debug Unit serial port (DBGU) and the USB Device Port.
SAM-BA
Flow Diagram
The Boot Program implements the algorithm shown in
Figure 21-1. Boot Program Algorithm Flow Diagram with USB
Figure 21-2. Boot Program Algorithm Flow Diagram without USB
®
Boot is then executed. It waits for transactions either on the USB device or on the DBGU serial port.
Device
Setup
Device
Setup
Run SAM-BA Boot
USB Enumeration
No
Sequence Successful ?
Successful ?
AutoBaudrate
Yes
Figure 21-1
No
or
Yes
Figure
Sequence Successful ?
Run SAM-BA Boot
No
Run SAM-BA Boot
SAM7S Series [DATASHEET]
21-2.
AutoBaudrate
Yes
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