AT89LP51ED2 Atmel Corporation, AT89LP51ED2 Datasheet - Page 221
AT89LP51ED2
Manufacturer Part Number
AT89LP51ED2
Description
Manufacturer
Atmel Corporation
Specifications of AT89LP51ED2
Flash (kbytes)
64 Kbytes
Max. Operating Frequency
20 MHz
Cpu
8051-1C
Max I/o Pins
42
Spi
1
Twi (i2c)
1
Uart
1
Adc Channels
7
Adc Resolution (bits)
10
Adc Speed (ksps)
153.8
Sram (kbytes)
2.25
Eeprom (bytes)
4096
Self Program Memory
API
Operating Voltage (vcc)
2.4 to 5.5
Timers
4
Isp
SPI/OCD/UART
Watchdog
Yes
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24.6.5.2
24.6.5.3
3714A–MICRO–7/11
Power-down Sequence
ISP Start Sequence
Figure 24-22. Serial Programming Power-up Sequence
Execute this sequence to power-down the device after programming.
Figure 24-23. Serial Programming Power-down 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.
1. Drive SCK low.
2. Wait at least t
3. Wait at least t
4. Wait at least t
5. Wait no more than t
1. Drive RST high.
2. Wait t
3. Drive SCK low.
4. Start programming session.
MISO
MOSI
RST
SCK
V
SS
DD
MISO
MOSI
RST
SCK
V
RLZ
SS
DD
+ t
STL
SSD
RHZ
SSZ
.
t
and tristate SCK.
SSD
and Tristate MOSI.
and drive RST low.
PWRDN
t
PWRUP
AT89LP51RD2/ED2/ID2 Preliminary
and power off VDD.
HIGH Z
HIGH Z
t
t
SSZ
POR
+ t
SUT
HIGH Z
HIGH Z
t
ZSS
t
PWRDN
221
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