参数资料
型号: T89C51AC2-RLTIM
厂商: Atmel
文件页数: 57/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
标准包装: 160
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 托盘
40
A/T89C51AC2
4127H–8051–02/08
Figure 22. Flash and Extra Row Programming Procedure
Hardware Security Byte
The following procedure is used to program the Hardware Security Byte space and is
summarized in Figure 23:
Set FPS and map Hardware byte (FCON = 0x0C)
Save and disable the interrupts.
Load DPTR at address 0000h.
Load Accumulator register with the data to load.
Execute the MOVX @DPTR, A instruction.
Launch the programming by writing the data sequence 54h followed by A4h in
FCON register. This step of the procedure must be executed from FM1. The end of
the programming indicated by the FBUSY flag cleared.
The end of the programming indicated by the FBusy flag cleared.
Restore the interrupts.
Flash Spaces
Programming
Save and Disable IT
EA = 0
Launch Programming
FCON = 5xh
FCON = Axh
End Programming
Restore IT
Column Latches Loading
FBusy
Cleared?
Clear Mode
FCON = 00h
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