Datasheet 搜索 > 微控制器 > ATMEL（爱特美尔） > AT91SAM7S64C-MU 数据手册 > AT91SAM7S64C-MU 其他数据使用手册 3/20 页
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AT91SAM7S64C-MU 其他数据使用手册 - ATMEL（爱特美尔）
制造商:
ATMEL（爱特美尔）
分类:
微控制器
封装:
QFN-64
描述:
AT91 系列 55 MHz 64 kB 闪存 16 kB SRAM 微控制器 - QFN-64
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AT91SAM7S64C-MU数据手册
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3
6220A–ATARM–06-Feb-06
AT91SAM CAN Bootloader
4. Device Initialization
Initialization follows the steps described below:
1. Stack setup for ARM supervisor mode
2. Setup the Embedded Flash Controller
3. Main oscillator frequency detection
4. Switch Master Clock on Main Oscillator
5. Copy code into SRAM
6. C variable initialization
7. PLL setup: PLL is initialized to generate a system clock of 24 MHz
8. Disable of the Watchdog and enable of the user reset
9. CAN PIO, Clock and CAN transceiver configuration
10. Jump to SAM-BA Boot4CAN sequence (see ”SAM-BA Boot4CAN” on page 4)
5. CAN Autobaudrate
The supported baudrates are 100 Kbits, 125 Kbits, 250 Kbits, 500 Kbits and 1 Mbit/s.
5.1 CAN Autobaudrate Limitation
The CAN autobaud implemented in SAM-BA Boot4CAN is efficient only in point-to-point con-
nection because, in this case, the transmit CAN message is repeated until a hardware
acknowledge is done by the receiver. This configuration corresponds to a host trying to send
CAN frames until the CAN node with SAM-BA Boot4CAN acknowledges one (Figure 6-3 on
page 8).
The bootloader can acknowledge an in-coming CAN frame only if a configuration is found.
This functionality is not guaranteed on a network with several CAN nodes.
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