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AT89S2051-24SC 데이터시트(PDF) 29 Page - ATMEL Corporation

부품명 AT89S2051-24SC
상세설명  8-bit Microcontroller with 2K/4K Bytes Flash
PDF  45 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89S2051-24SC 데이터시트(HTML) 29 Page - ATMEL Corporation

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3390C–MICRO–7/05
AT89S2051/S4051
31. Write Lock Bits/User Fuses
Function:
1.
Program Lock Bits 1 and 2.
2.
Program user fuses.
Usage:
1) Apply “1111” TestCode to P3.7, P3.5, P3.4, P3.3.
3.
Drive Port P1 with fuse data, bits [7:4] for fuses and bits [1:0] for lock bits.
4.
Pulse P3.2 low for 1 µs.
5.
Wait 4 ms, monitor P3.1, or poll data.
Figure 31-1. Write Lock Bits/User Fuses
32. Read Lock Bits/User Fuses
Function:
1.
Read status of Lock Bits 1 and 2.
2.
Read status of user fuses.
Usage:
1.
Apply “0011” TestCode to P3.7, P3.5, P3.4, P3.3.
2.
Read fuse data from Port P1, bits [7:4] for fuses and bits [1:0] for lock bits.
Figure 32-1. Read Lock Bits/User Fuses
DATA
1111
P3.2
XTAL1
P3.3 - P3.7
P1.0 - P1.7
RDY/BSY
High Z
High Z
DOUT
0011
P3.2
XTAL1
P3.3. - P3.7
P1.0 - P1.7
RDY/BSY
High Z
High Z



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