AT89LP2052 Atmel Corporation, AT89LP2052 Datasheet - Page 69

• Manufacturer Part Number: AT89LP2052
• Manufacturer: Atmel Corporation

Specifications of AT89LP2052

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 15
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 2
• Isp: SPI
• Watchdog: Yes

23.4.11
23.4.12
3547J–MICRO–10/09
Write Lock Bits
Read Lock Bits
Function:
Usage:
Figure 23-15. Write Lock Bits Sequence
Function:
Usage:
Figure 23-16. Read Lock Bits Sequence
Note:
• Program (lock) Lock Bits 1 and 2.
1. Bring CS (P3.2) low.
2. Drive P1 to AAh and pulse XTAL1 high.
3. Drive P1 to E4h and pulse XTAL1 high.
4. Drive P1 to 00h and pulse XTAL1 high.
5. Drive P1 to 00h and pulse XTAL1 high.
6. Drive data on P1 and pulse XTAL1 high.
7. Drive CS high.
8. Wait 4 ms, monitor P3.1, or poll data/status.
• Read status of Lock Bits 1 and 2.
1. Bring CS (P3.2) low.
2. Drive P1 to 0xAA and pulse XTAL1 high.
3. Drive P1 to 0x64 and pulse XTAL1 high.
4. Drive P1 to 0x00 and pulse XTAL1 high.
5. Drive P1 to 0x00 and bring XTAL1 high.
6. Tri-state P1.
7. Bring XTAL1 low.
8. Read data from P1.
9. Drive CS high.
RDY/BSY
XTAL1
XTAL1
The waveforms on this page are not to scale.
CS
P1
CS
P1
AAh
AAh
E4h
00h
64h
00h
00h
111111LL
AT89LP2052/LP4052
00h
111111LL
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