AT89LP428-20AU Atmel, AT89LP428-20AU Datasheet - Page 123

• Manufacturer Part Number: AT89LP428-20AU
• Description: MCU 8051 4K FLASH SPI 32TQFP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP428-20AU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 30
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Processor Series: AT89x
• Core: 8051
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

23.9.2
3654A–MICRO–8/09
Power-down Sequence
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. Drive SCK low.
2. Wait at least t
3. Tristate MOSI.
4. Wait at least t
5. Wait no more than t
MISO
MOSI
MISO
MOSI
SCK
RST
V
RST
SCK
V
SS
CC
SS
CC
t
SSD
SSD
SSZ
and then tristate SS and SCK.
and bring SS high.
PWRDN
t
PWRUP
and power off V
t
SSZ
HIGH Z
HIGH Z
HIGH Z
HIGH Z
t
POR
+ t
cc
.
SUT
t
PWRDN
t
ZSS
AT89LP428/828
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