AT89LP51 Atmel Corporation, AT89LP51 Datasheet - Page 5

• Manufacturer Part Number: AT89LP51
• Manufacturer: Atmel Corporation

Specifications of AT89LP51

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 36
• Uart: 1
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI
• Watchdog: Yes

Table 1-1.
3709D–MICRO–12/11
TQFP
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
PLCC
Pin Number
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1
2
3
4
5
6
AT89LP51/52 Pin Description
PDIP
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
1
2
3
4
5
VQFN
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Symbol
P2.3
P2.4
P2.5
P2.6
P2.7
P4.5
P4.4
P0.7
P0.6
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
VDD
P1.0
P1.1
P1.2
P1.3
P1.4
POL
Type
I/O
I/O
I/O
NC
I/O
I/O
I/O
I/O
I/O
I/O
I/O
NC
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
I
I
I
Description
P2.3: I/O Port 2 bit 3.
A11: External memory interface Address bit 11.
P2.4: I/O Port 2 bit 5.
A12: External memory interface Address bit 12.
P2.5: I/O Port 2 bit 5.
A13: External memory interface Address bit 13.
P2.6: I/O Port 2 bit 6.
A14: External memory interface Address bit 14.
P2.7: I/O Port 2 bit 7.
A15: External memory interface Address bit 15.
P4.5: I/O Port 4 bit 5.
PSEN: External memory interface Program Store Enable (active-low).
P4.4: I/O Port 4 bit 4.
ALE: External memory interface Address Latch Enable.
Not internally connected
POL: Reset polarity
P0.7: I/O Port 0 bit 7.
AD7: External memory interface Address/Data bit 7.
P0.6: I/O Port 0 bit 6.
AD6: External memory interface Address/Data bit 6.
P0.5: I/O Port 0 bit 5.
AD5: External memory interface Address/Data bit 5.
P0.4: I/O Port 0 bit 4.
AD4: External memory interface Address/Data bit 4.
P0.3: I/O Port 0 bit 3.
AD3: External memory interface Address/Data bit 3.
P0.2: I/O Port 0 bit 2.
AD2: External memory interface Address/Data bit 2.
P0.1: I/O Port 0 bit 1.
AD1: External memory interface Address/Data bit 1.
P0.0: I/O Port 0 bit 0.
AD0: External memory interface Address/Data bit 0.
Supply Voltage
Not internally connected
P1.0: I/O Port 1 bit 0.
T2: Timer 2 External Input or Clock Output.
P1.1: I/O Port 1 bit 1.
T2EX: Timer 2 External Capture/Reload Input.
P1.2: I/O Port 1 bit 2.
P1.3: I/O Port 1 bit 3.
P1.4: I/O Port 1 bit 4.
(See “External Reset” on page
33.)
AT89LP51/52
5