AT89LP216-20PI ATMEL [ATMEL Corporation], AT89LP216-20PI Datasheet - Page 72

• Manufacturer Part Number: AT89LP216-20PI
• Description: Microcontroller with 2K Bytes Flash
• Manufacturer: ATMEL [ATMEL Corporation]

23.8
23.8.1
23.8.2
72
Programming Interface Timing
AT89LP216 [Preliminary]
Power-up Sequence
Power-down Sequence
This section details general system timing sequences and constraints for entering or exiting In-
System Programming as well as parameters related to the Serial Peripheral Interface during
ISP. The general timing parameters for the following waveform figures are listed in section
ing Parameters” on page
Execute this sequence to enter programming mode immediately after power-up. In the RST pin
is disabled or if the ISP Fuse is disabled, this is the only method to enter programming (see
“External Reset” on page
Figure 23-5. Serial Programming Power-up Sequence
Execute this sequence to power-down the device after programming.
Figure 23-6. Serial Programming Power-down Sequence
1. Apply power between VCC and GND pins. RST should remain low.
2. Wait at least t
3. Wait at least t
4. Start programming session.
1. Drive SCK low.
2. Wait at least t
3. Tristate MOSI.
4. Wait at least t
5. Wait no more than t
depend on the current settings of the device.
MISO
MOSI
MISO
MOSI
RST
SCK
V
RST
SCK
V
SS
CC
SS
CC
t
SSD
PWRUP
SUT
SSD
SSZ
and then tristate SS and SCK.
for the internal Power-on Reset to complete. The value of t
and bring SS high.
. and drive SS high.
PWRDN
75.
14).
t
PWRUP
and power off VCC.
t
SSZ
HIGH Z
HIGH Z
HIGH Z
HIGH Z
t
POR
+ t
SUT
t
PWRDN
t
ZSS
3621A–MICRO–6/06
SUT
will
“Tim-