AT89LP52 Atmel Corporation, AT89LP52 Datasheet - Page 4

• Manufacturer Part Number: AT89LP52
• Manufacturer: Atmel Corporation

Specifications of AT89LP52

• Flash (kbytes): 8 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

1.5
Table 1-1.
4
TQFP
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
Pin Description
PLCC
AT89LP51/52
Pin Number
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
7
8
9
AT89LP51/52 Pin Description
PDIP
10
11
12
13
14
15
16
17
18
19
20
21
22
23
6
7
8
9
VQFN
10
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
1
Symbol
GND
P1.5
P1.6
P1.7
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P4.7
P4.6
P2.0
P2.1
P2.1
RST
Type
NC
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
I/O
I/O
I/O
O
O
O
O
O
O
O
I
I
I
I
I
Description
P1.5: I/O Port 1 bit 5.
MOSI: SPI master-out/slave-in. In UART SPI mode this pin is an output. During In-
System Programming, this pin is an input.
P1.6: I/O Port 1 bit 6.
MISO: SPI master-in/slave-out. In UART SPI mode this pin is an input. During In-
System Programming, this pin is an output.
P1.7: I/O Port 1 bit 7.
SCK: SPI Clock. In UART SPI mode this pin is an output. During In-System
Programming, this pin is an input.
RST: External Reset input (Reset polarity depends on POL pin.
on page
active.
P3.0: I/O Port 3 bit 0.
RXD: Serial Port Receiver Input.
Not internally connected
P3.1: I/O Port 3 bit 1.
TXD: Serial Port Transmitter Output.
P3.2: I/O Port 3 bit 2.
INT0: External Interrupt 0 Input or Timer 0 Gate Input.
P3.3: I/O Port 3 bit 3.
INT1: External Interrupt 1 Input or Timer 1 Gate Input
P3.4: I/O Port 3 bit 4.
T1: Timer/Counter 0 External input or output.
P3.5: I/O Port 3 bit 5.
T1: Timer/Counter 1 External input or output.
P3.6: I/O Port 3 bit 6.
WR: External memory interface Write Strobe (active-low).
P3.7: I/O Port 3 bit 7.
RD: External memory interface Read Strobe (active-low).
P4.7: I/O Port 4 bit 7.
XTAL2: Output from inverting oscillator amplifier. It may be used as a port pin if the
internal RC oscillator or external clock is selected as the clock source.
P4.6: I/O Port 4 bit 6.
XTAL1: Input to the inverting oscillator amplifier and internal clock generation circuits.
It may be used as a port pin if the internal RC oscillator is selected as the clock
source.
Ground
Not internally connected
P2.0: I/O Port 2 bit 0.
A8: External memory interface Address bit 8.
P2.1: I/O Port 2 bit 1.
A9: External memory interface Address bit 9.
P2.2: I/O Port 2 bit 2.
A10: External memory interface Address bit 10.
33.). The RST pin can output a pulse when the internal Watchdog reset is
See “External Reset”
3709D–MICRO–12/11