AT89C51-24AC Atmel, AT89C51-24AC Datasheet - Page 7

• Manufacturer Part Number: AT89C51-24AC
• Description: IC MICRO CTRL 24MHZ 44TQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51-24AC

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Number Of I /o: 32
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Peripherals: -

Flash Programming Modes
Note:
Figure 3. Programming the Flash
Mode
Write Code Data
Read Code Data
Write Lock
Chip Erase
Read Signature Byte
PROGRAMMING
MODES ABLE
3-24 MHz
SEE FLASH
OOOOH/OFFFH
1. Chip Erase requires a 10 ms PROG pulse.
ADDR.
T
A0 - A7
A8 - A11
Bit - 1
Bit - 2
Bit - 3
P1
P2.0 - P2.3
P2.6
P2.7
P3.6
P3.7
XTAL2
XTAL1
GND
AT89C51
RST
H
H
H
H
H
H
H
PSEN
RST
ALE
V
EA
P0
CC
PSEN
L
L
L
L
L
L
L
+5V
PGM
DATA
PROG
V /V
V
IH
IH
PP
ALE/PROG
Figure 4. Verifying the Flash
H
H
3-24 MHz
PROGRAMMING
MODES ABLE
SEE FLASH
OOOOH/0FFFH
(1)
ADDR.
T
EA/V
H/12V
H/12V
H/12V
H/12V
H/12V
A0 - A7
A8 - A11
H
H
PP
P1
P2.0 - P2.3
P2.6
P2.7
P3.6
P3.7
XTAL2
XTAL1
GND
P2.6
H
H
H
H
L
L
L
AT89C51
P2.7
H
H
H
L
L
L
L
PSEN
RST
ALE
V
EA
P0
CC
P3.6
H
H
H
H
L
L
L
+5V
PGM DATA
(USE 10K
PULLUPS)
V
P3.7
V
IH
IH
H
H
H
L
L
L
L
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