at89lp216-20xi ATMEL Corporation, at89lp216-20xi Datasheet - Page 73

• Manufacturer Part Number: at89lp216-20xi
• Description: At89lp216 8-bit Microcontroller With 2k Bytes Flash
• Manufacturer: ATMEL Corporation

23.8.3
23.8.4
3621B–MICRO–11/07
ISP Start Sequence
ISP Exit Sequence
Execute this sequence to exit CPU execution mode and enter ISP mode when the device has
passed Power-On Reset and is already operational.
Figure 23-7. In-System Programming (ISP) Start Sequence
Execute this sequence to exit ISP mode and resume CPU execution mode.
Figure 23-8. In-System Programming (ISP) Exit Sequence
Note:
1. Drive RST low.
2. Drive SS high.
3. Wait t
4. Start programming session.
1. Drive SCK low.
1. Wait at least t
2. Tristate MOSI.
3. Wait at least t
4. Tristate SCK.
5. Wait t
XTAL1
The waveforms on this page are not to scale.
MISO
MOSI
RST
SCK
V
RLZ
SS
RHZ
CC
XTAL1
MISO
MOSI
RST
SCK
V
SS
+ t
CC
and tristate SS.
STL
SSD
SSZ
.
and bring RST high.
and drive SS high.
t
SSD
t
SSZ
t
t
RLZ
RHZ
HIGH Z
HIGH Z
t
STL
HIGH Z
HIGH Z
t
ZSS
t
SSE
AT89LP216
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