AT89LP428 Atmel Corporation, AT89LP428 Datasheet - Page 3

• Manufacturer Part Number: AT89LP428
• Manufacturer: Atmel Corporation

Specifications of AT89LP428

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 25 MHz
• Cpu: 8051-1C
• Max I/o Pins: 30
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.75
• Eeprom (bytes): 512
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

1.5
Table 1-1.
3654A–MICRO–8/09
TQFP
/MLF
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Pin Number
Pin Description
PLCC
10
11
12
13
14
15
16
17
18
19
20
5
6
7
8
9
AT89LP428/828 Pin Description
PDIP
N/A
N/A
10
11
12
13
14
15
16
17
18
5
6
7
8
9
Symbol
GND
P4.1
P4.0
P4.5
P4.4
P3.2
P3.3
P3.4
P3.5
P3.6
P2.3
P2.1
P2.1
P2.0
P3.7
P1.0
Type
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
I/O
I/O
I/O
O
O
I
I
I
I
I
I
I
Description
P4.1: User-configurable I/O Port 4 bit 1.
XTAL2: Output from inverting oscillator amplifier. It may be used as a port pin if the
internal RC oscillator is selected as the clock source.
CLKOUT: When the internal RC oscillator is selected as the clock source, may be
used to output the internal clock divided by 2.
DDA: Serial Data input/output for On-chip Debug Interface when OCD is enabled
and the external clock is selected as the clock source.
P4.0: User-configurable I/O Port 4 bit 0.
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.
DDA: Serial Data input/output for On-chip Debug Interface when OCD is enabled
and the internal RC oscillator is selected as the clock source.
P4.5: User-configurable I/O Port 4 bit 5.
Ground
P4.4: User-configurable I/O Port 4 bit 4.
P3.2: User-configurable I/O Port 3 bit 2.
INT0: External Interrupt 0 Input or Timer 0 Gate Input.
P3.3: User-configurable I/O Port 3 bit 3.
INT1: External Interrupt 1 Input or Timer 1 Gate Input
P3.4: User-configurable I/O Port 3 bit 4.
T1: Timer/Counter 0 External input or PWM output.
P3.5: User-configurable I/O Port 3 bit 5.
T1: Timer/Counter 1 External input or PWM output.
P3.6: User-configurable I/O Port 3 bit 6 (if Reset Fuse is disabled).
RST: External Active-low Reset input (if Reset Fuse is enabled, see
on page
DCL: Serial Clock input for On-chip Debug Interface when OCD is enabled.
P2.3: User-configurable I/O Port 2 bit 3.
CCD: Timer 2 Channel D Compare Output or Capture Input.
P2.2: User-configurable I/O Port 2 bit 2.
CCC: Timer 2 Channel C Compare Output or Capture Input.
P2.1: User-configurable I/O Port 2 bit 1.
CCB: Timer 2 Channel B Compare Output or Capture Input.
P2.0: User-configurable I/O Port 2 bit 0.
CCA: Timer 2 Channel A Compare Output or Capture Input.
P3.7: User-configurable I/O Port 3 bit 7.
DDA: Serial Data input/output for On-chip Debug Interface when OCD is enabled
and the Crystal oscillator is selected as the clock source.
P1.0: User-configurable I/O Port 1 bit 0.
T2: Timer 2 External Input or Clock Output.
GPI0: General-purpose Interrupt input 0.
26).
AT89LP428/828
“External Reset”
3