AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 85

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

13.3
1768I–ATARM–09-Jul-09
Bootloader
The Boot Program is started from address 0x0000_0000 (ARM reset vector) when the on-chip
boot mode is selected (BMS high during the reset, only on devices with EBI integrated). The first
operation is the search for a valid program in the off-chip non-volatile memories. If a valid appli-
cation is found, this application is loaded into internal SRAM and executed by branching at
address 0x0000_0000 after remap. This application may be the application code or a second-
level Bootloader.
To optimize the downloaded application code size, the Boot Program embeds several functions
that can be reused by the application. The Boot Program is linked at address 0x0010_0000 but
the internal ROM is mapped at both 0x0000_0000 and 0x0010_0000 after reset. All the call to
functions is PC relative and does not use absolute addresses. The ARM vectors are present at
both addresses, 0x0000_0000 and 0x0010_0000.
To access the functions in ROM, a structure containing chip descriptor and function entry points
is defined at a fixed address in ROM.
If no valid application is detected, the debug serial port or the USB device port must be con-
nected to allow the upload. A specific application provided by Atmel (DFU uploader) loads the
application into internal SRAM through the USB. To load the application through the debug
serial port, a terminal application (HyperTerminal) running the Xmodem protocol is required.
Figure 13-2. Remap Action after Download Completion
After reset, the code in internal ROM is mapped at both addresses 0x0000_0000 and
0x0010_0000:
100000
100004
100008
10000c
100010
100014
100018
10001c
ea00000b
e59ff014
e59ff014
e59ff014
e59ff014
00001234
e51fff20
e51fff20
0x0020_0000
0x0000_0000
B
LDR
LDR
LDR
LDR
LDR
LDR
LDR
Internal
Internal
SRAM
ROM
0x2c00ea00000bB0x2c
PC,[PC,20]04e59ff014LDRPC,[PC,20]
PC,[PC,20]08e59ff014LDRPC,[PC,20]
PC,[PC,20]0ce59ff014LDRPC,[PC,20]
PC,[PC,20]10e59ff014LDRPC,[PC,20]
PC,[PC,20]1400001234LDRPC,[PC,20]
PC,[PC,-0xf20]18e51fff20LDRPC,[PC,-0xf20]
PC,[PC,-0xf20]1ce51fff20LDRPC,[PC,-0xf20]
REMAP
Internal
Internal
SRAM
ROM
AT91RM9200
0x0010_0000
0x0000_0000
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