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AT89LP4052-20PI Datasheet(PDF) 59 Page - ATMEL Corporation

Part # AT89LP4052-20PI
Description  8-bit Microcontroller with 2/4-Kbyte Flash
PDF  90 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP4052-20PI Datasheet(HTML) 59 Page - ATMEL Corporation

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3547F–MICRO–6/06
AT89LP2052/LP4052
22.4.3
Program Enable
Function:
• Enables the programming interface to receive commands.
• Program Enable must be the first command issued in any programming session. In parallel
programming a session is active while RST remains at V
PP. In serial programming a session
is active while RST remains at V
CC.
Usage:
1.
Bring CS (P3.2) low.
2.
Drive P1 to AAh and pulse XTAL1 high.
3.
Drive P1 to ACh and pulse XTAL1 high.
4.
Drive P1 to 53h and pulse XTAL1 high.
5.
Bring CS high.
Figure 22-7. Program Enable Sequence
22.4.4
Chip Erase
Function:
• Erases (programs FFh to) the entire 2/4-Kbyte memory array.
• Erases User Signature Row if User Row Programming Fuse bit is enabled.
• Lockbit1 and Lockbit2 are programmed to “unlock” state.
Usage:
1.
Bring CS (P3.2) low.
2.
Drive P1 to AAh and pulse XTAL1 high.
3.
Drive P1 to 8Ah and pulse XTAL1 high.
4.
Bring CS high.
5.
Wait 4 ms, monitor P3.1, or poll data/status.
Figure 22-8. Chip Erase Sequence
Note:
The waveforms on this page are not to scale.
AAh
ACh
53h
CS
XTAL1
P1
AAh
8Ah
CS
XTAL1
P1
RDY/BSY



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