AT89LP4052-20PU Atmel, AT89LP4052-20PU Datasheet - Page 67

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

Specifications of AT89LP4052-20PU

• 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-DIP (0.300", 7.62mm)
• 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: Through Hole
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

23.4.9
3547J–MICRO–10/09
Read User Signature Page
Function:
Usage:
Figure 23-13. Read User Signature Page Sequence
Note:
• Read 1 to 32 bytes of data from the User Signature Row.
• The byte address (offset in page) is initialized to bits [4:0] of the low address byte. The
• Read data will be output on P1 after the falling edge of fourth XTAL1 pulse (address low byte
1. Bring CS (P3.2) low.
2. Drive P1 to AAh and pulse XTAL1 high.
3. Drive P1 to 32h and pulse XTAL1 high.
4. Drive P1 to 00h and pulse XTAL1 high.
5. Drive P1 with bits [4:0] of address and bring XTAL1 high.
6. Tri-state P1.
7. Bring XTAL1 low.
8. Read data from P1.
9. To read additional data bytes in the page, pulse XTAL1 high to increment to the next
10. Drive CS high.
internal address is incremented by one on the negative edge of the XTAL1 pulse. The
address will wrap around to the 1st byte of the page when incremented past 31.
strobe). The programmer should tri-state P1 prior to this edge to avoid bus contention on P1.
XTAL1
address.
CS
P1
The waveform on this page is not to scale.
AAh
32h
00h
000bbbbb
AT89LP2052/LP4052
DOUT 0
DOUT 1
DOUTn
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