AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 25

• 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

8.8.6
8.9
8.10
9.
Calibration Bits
Eight NVM bits are used to calibrate the brownout detector and the voltage regulator. These bits are factory configured
and cannot be changed by the user. The ERASE pin has no effect on the calibration bits.
Fast Flash Programming Interface
The Fast Flash Programming Interface allows programming the device through either a serial JTAG interface or through
a multiplexed fully-handshaked parallel port. It allows gang-programming with market-standard industrial programmers.
The FFPI supports read, page program, page erase, full erase, lock, unlock and protect commands.
The Fast Flash Programming Interface is enabled and the Fast Programming Mode is entered when the TST pin and the
PA0 and PA1 pins are all tied high and PA2 is tied low.
SAM-BA Boot Assistant
The SAM-BA
SAM-BA Boot recovery is performed when the TST pin and the PA0, PA1 and PA2 pins are all tied high for 10 sec-
onds. Then, a power cycle of the board is mandatory.
The SAM-BA Boot Assistant is a default Boot Program that provides an easy way to program in situ the on-chip Flash
memory.
The SAM-BA Boot Assistant supports serial communication through the DBGU or through the USB Device Port. (The
SAM7S32/16 have no USB Device Port.)
The SAM-BA Boot provides an interface with SAM-BA Graphic User Interface (GUI).
System Controller
The System Controller manages all vital blocks of the microcontroller: interrupts, clocks, power, time, debug and reset.
The System Controller peripherals are all mapped to the highest 4 Kbytes of address space, between addresses 0xFFFF
F000 and 0xFFFF FFFF.
Figure 9-1 on page 26
Figure 8-1 on page 20
memory controller configuration user interface is also mapped within this address space.
Communication through the DBGU supports a wide range of crystals from 3 to 20 MHz via software auto-
detection.
Communication through the USB Device Port is limited to an 18.432 MHz crystal. (
®
Boot Recovery restores the SAM-BA Boot in the first two sectors of the on-chip Flash memory. The
shows the mapping of the of the User Interface of the System Controller peripherals. Note that the
and
Figure 9-2 on page 27
show the product specific System Controller Block Diagrams.
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
25