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AT89LP4052 Datasheet(PDF) 75 Page - ATMEL Corporation

Part # AT89LP4052
Description  8-bit Microcontroller with 2/4-Kbyte Flash
PDF  94 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LP4052 Datasheet(HTML) 75 Page - ATMEL Corporation

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3547J–MICRO–10/09
AT89LP2052/LP4052
23.5.2
Power-down Sequence
Execute this sequence to power-down the device after serial programming.
1.
Tri-state MOSI (P1.5).
2.
Bring SCK (P1.7) to “L”.
3.
Bring RST to “L”.
4.
Bring SS (P1.4) to “L”
5.
Power off Vcc.
Figure 23-23. Serial Programming Power-down Sequence
Note:
The waveforms on this page are not to scale.
23.5.3
ISP Start Sequence
Execute this sequence to enter ISP when the device is already operational.
1.
Bring SS (P1.4) to “H”.
2.
Tri-state MISO (P1.6).
3.
Bring RST to “H”.
4.
Bring SCK (P1.7) to “L”.
Figure 23-24. In-System Programming (ISP) Start Sequence
VCC
RST
SS
SCK
HIGH Z
MISO
HIGH Z
MOSI
VCC
RST
SS
SCK
HIGH Z
MOSI
HIGH Z
MISO
XTAL1



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