AT89C55-24QI Atmel, AT89C55-24QI Datasheet - Page 5

• Manufacturer Part Number: AT89C55-24QI
• Description: Microcontrollers (MCU) Microcontroller
• Manufacturer: Atmel

Specifications of AT89C55-24QI

• 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: PQFP-44
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: No

Table 1. AT89C55 SFR Map and Reset Values
0D8H
0D0H
0C8H
0C0H
0E8H
0E0H
0B8H
0B0H
0A8H
0A0H
0F8H
0F0H
98H
90H
88H
80H
XX000000
0X000000
00000000
00000000
00000000
00000000
11111111
11111111
00000000
11111111
00000000
11111111
T2CON
SCON
TCON
PSW
ACC
P3
P2
P1
P0
IP
IE
B
XXXXXXXX
XXXXXX00
00000000
00000111
T2MOD
TMOD
SBUF
SP
00000000
00000000
00000000
RCAP2L
DPL
TL0
00000000
00000000
00000000
RCAP2H
DPH
TL1
00000000
00000000
TH0
TL2
00000000
00000000
TH2
TH1
0XXX0000
PCON
0FFH
0F7H
0EFH
0E7H
0DFH
0D7H
0CFH
0C7H
0BFH
0B7H
0AFH
0A7H
9FH
97H
8FH
87H
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