AT89LP4052-20SU Atmel, AT89LP4052-20SU Datasheet - Page 66

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

Specifications of AT89LP4052-20SU

• 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-SOIC (7.5mm Width)
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI/UART
• 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: 20SOIC W
• 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: Lead free / RoHS Compliant

23.4.8
66
AT89LP2052/LP4052
Write User Signature Page
Function:
Usage:
Note:
Figure 23-12. Write User Signature Page Sequence
Note:
RDY/BSY
• Programs 1 to 32 bytes of data into the User Signature Row.
• The User Row Programming Fuse must be enabled before writing to the User Signature Row.
• The byte address (offset in page) is initialized to bits [4:0] of the low address byte. One byte
1. Bring CS (P3.2) low.
2. Drive P1 to AAh and pulse XTAL1 high.
3. Drive P1 to 52h and pulse XTAL1 high.
4. Drive P1 to 00h and pulse XTAL1 high.
5. Drive P1 with bits [4:0] of address and pulse XTAL1 high.
6. To write only previously loaded data, bring CS high before loading additional bytes. To
7. Bring CS high.
8. Wait 2 ms, monitor P3.1, or poll data/status.
of data is loaded from P1 for the current address by the positive edge of a XTAL1 pulse. The
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, however
previously loaded bytes should not be re-loaded.
XTAL1
load data bytes, drive data on P1 and pulse XTAL1 high to load one byte and increment
to the next address. Repeat for additional bytes. Only 1-32 bytes may be programmed
at one time, including any bytes loaded by a previous load page buffer command. Bytes
should not be loaded more than once.
CS
P1
It is not possible to skip bytes while loading data during write. To load non-contiguous bytes in a
page, use the Load Page Buffer command.
The waveform on this page is not to scale.
AAh
52h
00h
000bbbbb
DIN 0
DIN 1
DIN n
3547J–MICRO–10/09