AT89C55WD-24AU Atmel, AT89C55WD-24AU Datasheet - Page 25

• Manufacturer Part Number: AT89C55WD-24AU
• Description: IC 8051 MCU FLASH 20K 44TQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C55WD-24AU

• 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: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: UART
• Maximum Clock Frequency: 33 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

23. Flash Programming and Verification Waveforms
24. Lock Bit Programming
25. Parallel Chip Erase Mode
1921D–MICRO–6/08
Test Conditions
ALE/PROG
V
Lockbit_1, 2 or 3
CC
Test Conditions
P3<0>
Setup
= 6.5V
V
ALE/PROG
Data Setup
CC
P1.0 - P1.7
P2.0 - P2.5
ALE/PROG
(RDY/BSY)
(ENABLE)
= 6.5V
Setup
PORT 0
P3.0
P2.7
EA/V
200 ns
P3.4
PP
Erase
t
t
SHGL
AVGL
Erase
DC
t
EHSH
V
PROGRAMMING
PP
t
DVGL
ADDRESS
100 µs
DATA IN
t
GLGH
t
GHBL
t
GHDX
10 ms
t
ELQV
t
200 ns
GHAX
t
GHSL
LOGIC 1
LOGIC 0
BUSY
Test Conditions Setup
t
WC
Erase
VERIFICATION
DATA OUT
ADDRESS
t
AVQV
READY
V
CC
Wait 10 ms to reload
new lock bit status
Erase
DC
= 4.5V to 5.5V
t
V
EHQZ
CC
AT89C55WD
= 4.5V to 5.5V
Wait 10 ms before
reprogramming
25