AT89C1051-24SC Atmel, AT89C1051-24SC Datasheet - Page 7

• Manufacturer Part Number: AT89C1051-24SC
• Description: IC MCU 1KB FLASH 24MHZ 20-SOIC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C1051-24SC

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Peripherals: LED
• Number Of I /o: 15
• Program Memory Size: 1KB (1K x 8)
• Program Memory Type: FLASH
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Other names: AT89C105124SC

Chip Erase: The entire PEROM array (1K byte) 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 normal 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.
Figure 3. Programming the Flash Memory
PROGRAMMING
MODES TABLE
ADDRESS COUNTER
SEE FLASH
(000H) = 1EH indicates manufactured by Atmel
(001H) = 11H indicates 89C1051
TO INCREMENT
RDY/BSY
PROG
P3.1
P3.2
P3.3
P3.4
P3.5
P3.7
XTAL1
GND
AT89C1051
RST
V
P1
CC
5V
PGM
DATA
V / V
I H
PP
Programming Interface
Every code byte in the Flash array can be written and the
entire array can be erased by using the appropriate combi-
nation of control signals. The write operation cycle is self-
timed and once initiated, will automatically time itself to
completion.
Figure 4. Verifying the Flash Memory
PROGRAMMING
MODES TABLE
SEE FLASH
V
I H
P3.2
P3.3
P3.4
P3.5
P3.7
XTAL1
GND
AT89C1051
RST
V
P1
CC
5V
DATA
PGM
V
I H
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