AT89LP4052-20XU Atmel, AT89LP4052-20XU Datasheet - Page 76

• Manufacturer Part Number: AT89LP4052-20XU
• Description: IC 8051 MCU FLASH 4K 20TSSOP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP4052-20XU

• 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: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-TSSOP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: UART, SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 2
• Operating Supply Voltage: 2.4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Minimum Operating Temperature: - 40 C
• Package: 20TSSOP
• Device Core: 8051
• Family Name: AT89
• Maximum Speed: 20 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

23.5.4
23.5.5
76
AT89LP2052/LP4052
ISP Exit Sequence
ISP Byte Sequence
Execute this sequence to exit ISP and resume execution.
Figure 23-25. In-System Programming (ISP) Exit Sequence
Note:
The ISP byte sequence is shown in
Figure 23-26. ISP Byte Sequence
1. Bring SS (P1.4) to “H”.
2. Tri-state MOSI (P1.5).
3. Tri-state SCK (P1.7).
4. Bring RST to “L”.
5. Tri-state SS.
• Data shifts in/out MSB first.
• MISO changes at falling edge of SCK.
• MOSI is sampled at rising edge of SCK.
The waveforms on this page are not to scale.
MOSI
MISO
SCK
XTAL1
MISO
MOSI
RST
SCK
V
SS
CC
7
7
6
6
Data Sampled
Figure
5
5
23-26.
4
4
HIGH Z
HIGH Z
3
3
2
2
1
1
3547J–MICRO–10/09
0
0