AT89C55WD-24AC Atmel, AT89C55WD-24AC Datasheet - Page 22

• Manufacturer Part Number: AT89C55WD-24AC
• Description: IC MICRO CTRL 24MHZ 44TQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C55WD-24AC

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-TQFP, 44-VQFP
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3 bit
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No RoHS Version Available
• Other names: AT89C55WD24AC

Table 21-1.
Notes:
22
Mode
Write Code
Data
Read Code
Data
Write Lock Bit
1
Write Lock Bit
2
Write Lock Bit
3
Read Lock Bits
1, 2, 3
Chip Erase
Read Atmel ID
Read Device
ID
Read Device
ID
1. Write Code Data requires a 200 ns PROG pulse.
2. Write Lock Bits requires a 100 µs PROG pulse.
3. Chip Erase requires a 200 ns - 500 ns PROG pulse.
4. RDY/BSY signal is output on P3.0 during programming.
AT89C55WD
Flash Programming Modes
V
6.5
6.5
6.5
6.5
5V
5V
5V
5V
5V
5V
CC
V
V
V
V
RST
H
H
H
H
H
H
H
H
H
H
PSEN
L
L
L
L
L
L
L
L
L
L
PROG
ALE/
H
H
H
H
H
(1)
(2)
(2)
(2)
(3)
H/12V
EA/
V
12V
12V
12V
12V
12V
H
H
H
H
PP
P2.6
H
H
H
H
H
L
L
L
L
L
P2.7
H
H
H
H
L
L
L
L
L
L
P3.3
H
H
H
H
H
L
L
L
L
L
P3.6
H
H
H
H
H
L
L
L
L
L
P3.7
H
H
H
L
L
L
L
L
L
L
P0.7-0
Data
P0.2,
P0.3,
D
P0.4
1EH
55H
06H
D
OUT
X
X
X
X
IN
P3.4
A14
A14
X
X
X
X
X
X
X
X
XX 0000
XX 0001
XX 0010
Address
P2.5-0
A13-8
A13-8
1921D–MICRO–6/08
X
X
X
X
X
P1.7-0
A7-0
A7-0
00H
00H
00H
X
X
X
X
X