AT89C2051-12SU Atmel, AT89C2051-12SU Datasheet - Page 8

IC 8051 MCU FLASH 2K 20SOIC

AT89C2051-12SU

Manufacturer Part Number
AT89C2051-12SU
Description
IC 8051 MCU FLASH 2K 20SOIC
Manufacturer
Atmel
Series
89Cr
Datasheet

Specifications of AT89C2051-12SU

Core Processor
8051
Core Size
8-Bit
Speed
12MHz
Connectivity
UART/USART
Peripherals
LED
Number Of I /o
15
Program Memory Size
2KB (2K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SOIC (7.5mm Width)
Package
20SOIC
Device Core
8051
Family Name
89C
Maximum Speed
12 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
15
Interface Type
UART
Number Of Timers
2
Processor Series
AT89x
Core
8051
Data Ram Size
128 B
Maximum Clock Frequency
12 MHz
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
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

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8
AT89C2051
To Program and Verify the Array:
Data Polling: The AT89C2051 features Data Polling to indicate the end of a write cycle. During
a write cycle, an attempted read of the last byte written will result in the complement of the writ-
ten data on P1.7. Once the write cycle has been completed, true data is valid on all outputs, and
the next cycle may begin. Data Polling may begin any time after a write cycle has been initiated.
Ready/Busy: The Progress of byte programming can also be monitored by the RDY/BSY output
signal. Pin P3.1 is pulled low after P3.2 goes High during programming to indicate BUSY. P3.1 is
pulled High again when programming is done to indicate READY.
Program Verify: If lock bits LB1 and LB2 have not been programmed code data can be read
back via the data lines for verification:
The lock bits cannot be verified directly. Verification of the lock bits is achieved by observing that
their features are enabled.
Chip Erase: The entire PEROM array (2K bytes) and the two Lock Bits are erased electrically
by using the proper combination of control signals and by holding P3.2 low for 10 ms. The code
array is written with all “1”s in the Chip Erase operation and must be executed before any non-
blank memory byte can be re-programmed.
Reading the Signature Bytes: The signature bytes are read by the same procedure as a nor-
mal verification of locations 000H, 001H, and 002H, except that P3.5 and P3.7 must be pulled to
a logic low. The values returned are as follows.
4. Apply data for Code byte at location 000H to P1.0 to P1.7.
5. Raise RST to 12V to enable programming.
6. Pulse P3.2 once to program a byte in the PEROM array or the lock bits. The byte-write
7. To verify the programmed data, lower RST from 12V to logic “H” level and set pins P3.3
8. To program a byte at the next address location, pulse XTAL1 pin once to advance the
9. Repeat steps 6 through 8, changing data and advancing the address counter for the
10. Power-off sequence:
1. Reset the internal address counter to 000H by bringing RST from “L” to “H”.
2. Apply the appropriate control signals for Read Code data and read the output data at
3. Pulse pin XTAL1 once to advance the internal address counter.
4. Read the next code data byte at the port P1 pins.
5. Repeat steps 3 and 4 until the entire array is read.
(000H) = 1EH indicates manufactured by Atmel
(001H) = 21H indicates 89C2051
cycle is self-timed and typically takes 1.2 ms.
to P3.7 to the appropriate levels. Output data can be read at the port P1 pins.
internal address counter. Apply new data to the port P1 pins.
entire 2K bytes array or until the end of the object file is reached.
set XTAL1 to “L”
set RST to “L”
Turn V
the port P1 pins.
CC
power off
0368H–MICRO–6/08

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