at89lp2052-20xi ATMEL Corporation, at89lp2052-20xi Datasheet - Page 60

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

23.4.1
23.4.2
60
AT89LP2052/LP4052
Power-up Sequence
Power-down Sequence
Execute the following sequence to power-up the device before parallel programming.
Figure 23-5. Parallel Mode Power-up Operation
Execute the following sequence to power-down the device after parallel programming.
Figure 23-6. Parallel Mode Power-down Operation
Note:
1. Apply power between VCC and GND pins.
2. After V
3. Wait 2 ms for the internal Power-on Reset to time out.
4. Bring P3.2 to “H” and then wait 10 µs.
5. Raise RST/V
6. After V
1. Tri-state P1.
2. Bring RST/V
3. Bring XTAL and P3.2 to “L”.
4. Bring RST to “L” and wait 10 µs.
5. Power off V
XTAL1
XTAL1
The waveforms on this page are not to scale.
P3.2
P3.2
RST
RST
V
V
P1
P1
CC
CC
CC
PP
has settled, wait an additional 10 µs before programming.
has settled, wait 10 µs and bring RST to “H”.
CC
PP
PP
.
down from 12V to V
to 12V to enable the parallel programming modes.
CC
HIGH Z
and wait 10 µs.
HIGH Z
3547H–MICRO–5/07
V
V
V
V
PP
IH
PP
IH