AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 29
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AT89S2051
Manufacturer Part Number
AT89S2051
Description
Manufacturer
Atmel Corporation
Specifications of AT89S2051
Flash (kbytes)
2 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
15
Uart
1
Sram (kbytes)
0.25
Operating Voltage (vcc)
2.7 to 5.5
Timers
2
Isp
SPI
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89S2051-24PI
Manufacturer:
ATMEL
Quantity:
918
Company:
Part Number:
AT89S2051-24PU
Manufacturer:
ATMEL
Quantity:
2 300
Part Number:
AT89S2051-24PU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT89S2051-24SU
Manufacturer:
MICROCHIP
Quantity:
3 420
Part Number:
AT89S2051-24SU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
31. Write Lock Bits/User Fuses
32. Read Lock Bits/User Fuses
3390E–MICRO–6/08
Function:
Usage:
1) Apply “1111” TestCode to P3.7, P3.5, P3.4, P3.3.
Figure 31-1. Write Lock Bits/User Fuses
Function:
Usage:
Figure 32-1. Read Lock Bits/User Fuses
1. Program Lock Bits 1 and 2.
2. Program user fuses.
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.
1. Read status of Lock Bits 1 and 2.
2. Read status of user fuses.
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.
P3.3. - P3.7
RDY/BSY
RDY/BSY
P3.3 - P3.7
P1.0 - P1.7
P1.0 - P1.7
XTAL1
XTAL1
P3.2
P3.2
High Z
High Z
DATA
1111
DOUT
0011
AT89S2051/S4051
High Z
High Z
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