AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 166

• Manufacturer Part Number: AT89LP6440-20PU
• Description: MCU 8051 64K FLASH ISP 40PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20PU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

25.9.2
25.9.3
166
AT89LP6440 - Preliminary
Power-down Sequence
ISP Start Sequence
Figure 25-7. Serial Programming Power-up Sequence
Execute this sequence to power-down the device after programming.
Figure 25-8. 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. Tristate MOSI.
4. Wait at least t
5. Wait no more than t
1. Drive RST low.
2. Drive SS high.
3. Wait t
4. Start programming session.
MISO
MOSI
MISO
MOSI
RST
SCK
V
RST
SCK
V
SS
DD
SS
DD
RLZ
+ t
STL
t
SSD
SSD
SSZ
.
and then tristate SS and SCK.
and bring SS high.
PWRDN
t
PWRUP
and power off VDD.
t
SSZ
HIGH Z
HIGH Z
HIGH Z
HIGH Z
t
POR
+ t
SUT
t
PWRDN
t
ZSS
3706A–MICRO–9/09