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AT89C51AC3-RDTIM 数据表(PDF) 46 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM 数据表(HTML) 46 Page - ATMEL Corporation |
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46 / 140 page  46 AT89C51AC3 4383D–8051–02/08 Table 16. Programming Spaces Notes: 1. The sequence 5xh and Axh must be executing without instructions between them otherwise the programming is not executed (see Flash Status Register) 2. The sequence 5xh and Axh must be executed with the same FMOD0 FMOD1 configuration. 3. Interrupts that may occur during programming time must be disabled to avoid any spurious exit of the programming mode. Status of the Flash Memory The bit FBUSY in FCON register is used to indicate the status of programming. FBUSY is set when programming is in progress. The flash programming process is launched the second machine cycle following the sequence 5xh and Axh in FCON. Thus the FBUSY flag should be read by sofware not during the insctruction after the 5xh, Axh sequence but the the second instruction after the 5xh, Axh sequence in FCON (See next example). FBUSY is cleared when the pro- gramming is completed. ;*F************************************************************************* ;* NAME: launch_prog ;;*************************************************************************** launch_prog: MOV FCON, #050h MOV FCON #0A0h ; Flash Write Sequence NOP ;Required time before reading busy flag wait_busy: MOV A,FCON JB ACC.0,wait_busy RET Selecting FM1 The bit ENBOOT in AUXR1 register is used to map FM1 from F800h to FFFFh. Loading the Column Latches Any number of data from 1-byte to 128 Bytes can be loaded in the column latches. This provides the capability to program the whole memory by byte, by page or by any number of Bytes in a page. Data written in the column latches do not have to be in consecutive Write to FCON Operation FPL3:0 FPS FMOD1 FMOD0 User 5 X 0 0 No action A X 0 0 Write the column latches in user space Extra Row 5 X 0 1 No action A X 0 1 Write the column latches in extra row space Hardware Security Byte 5 X 1 0 No action A X 1 0 Write the fuse bits space Reset Columns Latches 5 X 1 1 No action A X 1 1 Reset the column latches |
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