at89lp2052-20xi ATMEL Corporation, at89lp2052-20xi Datasheet - Page 74

• Manufacturer Part Number: at89lp2052-20xi
• Description: At89lp2052 8-bit Microcontroller With 2/4-kbyte Flash
• Manufacturer: ATMEL Corporation

23.5.2
23.5.3
74
AT89LP2052/LP4052
Power-down Sequence
ISP Start Sequence
Execute this sequence to power-down the device after serial programming.
Figure 23-23. Serial Programming Power-down Sequence
Note:
Execute this sequence to enter ISP when the device is already operational.
Figure 23-24. In-System Programming (ISP) Start Sequence
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.
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”.
The waveforms on this page are not to scale.
XTAL1
MISO
MOSI
MISO
MOSI
RST
SCK
RST
SCK
V
V
SS
SS
CC
CC
HIGH Z
HIGH Z
HIGH Z
HIGH Z
3547H–MICRO–5/07