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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89C5131-RDTIL 데이터시트(PDF) 45 Page - ATMEL Corporation |
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AT89C5131-RDTIL 데이터시트(HTML) 45 Page - ATMEL Corporation |
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45 / 176 page  45 AT89C5131 4136B–USB–09/03 Hardware Security Byte Default value after erasing chip: FFh Notes: 1. Only the 4 MSB bits can be access by software. 2. The 4 LSB bits can only be access by parallel mode. Table 44. Hardware Security Byte 765 43210 X2B BLJB OSCON1 OSCON0 - LB2 LB1 LB0 Bit Number Bit Mnemonic Description 7X2B X2 Bit Set this bit to start in standard mode Clear this bit to start in X2 mode. 6BLJB Bootloader Jump Bit Set this bit to start the user’s application on next reset at address 0000h. Cleared this bit to start the bootloader at address F400h (default). 5-4 OSCON1-0 Oscillator Control Bits These two bits are used to control the oscillator in order to reduce consumption. OSCON1 OSCON0 Description 1 1 oscillator is configured to run from 0 to 32 MHz 1 0 oscillator is configured to run from 0 to 16 MHz 0 1 oscillator is configured to run from 0 to 8 MHz 0 0 this configuration shouldn’t be set 3- Reserved The value read from this bit is indeterminate. 2-0 LB2:0 Lock Bits |
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