AT89C55-24JI Atmel, AT89C55-24JI Datasheet - Page 15

• Manufacturer Part Number: AT89C55-24JI
• Description: Microcontrollers (MCU) 80C31 w/20k
• Manufacturer: Atmel

Specifications of AT89C55-24JI

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 20 KB
• Data Ram Size: 256 B
• Interface Type: UART
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-44
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: No

Flash Programming Modes
Note:
Mode
Write Code Data
Read Code Data
Write Lock
Chip Erase
Read Signature Byte
1. Chip Erase requires a 10-ms PROG pulse.
Bit-1
Bit-3
Bit-2
RST
H
H
H
H
H
H
H
PSEN
L
L
L
L
L
L
L
ALE/PROG
H
H
(1)
EA/V
H/12V
H/12V
H/12V
H/12V
H/12V
H
H
PP
P2.6
H
H
H
H
L
L
L
P2.7
H
H
H
L
L
L
L
P3.6
H
H
H
H
L
L
L
P3.7
4-183
H
H
H
L
L
L
L