参数资料
型号: DSPIC33FJ12MC202T-I/SS
厂商: Microchip Technology
文件页数: 99/155页
文件大小: 0K
描述: IC DSPIC MCU/DSP 12K 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 2,100
系列: dsPIC™ 33F
核心处理器: dsPIC
芯体尺寸: 16-位
速度: 40 MIP
连通性: I²C,IrDA,SPI,UART/USART
外围设备: 高级欠压探测/复位,电机控制 PWM,QEI,POR,PWM,WDT
输入/输出数: 21
程序存储器容量: 12KB(12K x 8)
程序存储器类型: 闪存
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 6x10b/12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
48
A/T89C51AC2
4127H–8051–02/08
Boot Process
Software Boot Process
Example
Many algorithms can be used for the software boot process. Below are descriptions of
the different flags and Bytes.
Boot Loader Jump Bit (BLJB):
- This bit indicates if on RESET the user wants to jump to this application at address
@0000h on FM0 or execute the boot loader at address @F800h on FM1.
- BLJB = 0 (i.e. bootloader FM1 executed after a reset) is the default Atmel factory pro-
gramming.
- To read or modify this bit, the APIs are used.
Boot Vector Address (SBV):
- This byte contains the MSB of the user boot loader address in FM0.
- The default value of SBV is FCh (no user boot loader in FM0).
- To read or modify this byte, the APIs are used.
Extra Byte (EB) and Boot Status Byte (BSB):
- These Bytes are reserved for customer use.
- To read or modify these Bytes, the APIs are used.
Hardware Boot Process
At the falling edge of RESET, the bit ENBOOT in AUXR1 register is initialized with the
value of Boot Loader Jump Bit (BLJB).
Further at the falling edge of RESET if the following conditions (called Hardware condi-
tion) are detected. The FCON register is initialized with the value 00h and the PC is
initialized with F800h (FM1 lower byte = Bootloader entry point).
Harware Conditions:
PSEN low(1)
EA high,
ALE high (or not connected).
The Hardware condition forces the bootloader to be executed, whatever BLJB value is.
Then BLBJ will be checked.
If no hardware condition is detected, the FCON register is initialized with the value F0h.
Then BLJB value will be checked.
Conditions are:
If bit BLJB = 1:
User application in FM0 will be started at @0000h (standard reset).
If bit BLJB = 0:
Boot loader will be started at @F800h in FM1.
Note:
1. As PSEN is an output port in normal operating mode (running user applications or
bootloader applications) after reset it is recommended to release PSEN after the fall-
ing edge of Reset is signaled.
The hardware conditions are sampled at reset signal Falling Edge, thus they can be
released at any time when reset input is low.
2. To ensure correct microcontroller startup, the PSEN pin should not be tied to ground
during power-on.
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