AT89LP51ED2-20AU Atmel, AT89LP51ED2-20AU Datasheet - Page 221

• Manufacturer Part Number: AT89LP51ED2-20AU
• Description: 8-bit Microcontrollers - MCU 64KB 20MHz 2.4V-5.5V
• Manufacturer: Atmel

Specifications of AT89LP51ED2-20AU

• Rohs: yes
• Core: 8051
• Processor Series: AT89x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TQFP-44
• Mounting Style: SMD/SMT
• Data Rom Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Program Memory Type: Flash
• Factory Pack Quantity: 160

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
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