AT89LP51 Atmel Corporation, AT89LP51 Datasheet - Page 105

• 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

18.8.2
Note:
18.8.3
Notes:
18.8.4
18.8.5
3709D–MICRO–12/11
1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to
1. For active supply current measurements all ports are configured in quasi-bidirectional mode. Timers 0, 1 and 2 are config-
Float Waveform
I
I
Clock Signal Waveform for I
CC
CC
float when 100 mV change from the loaded V
ured to be free running in their default timer modes. The CPU executes a simple random number generator that accesses
RAM and SFR bus, and exercises the ALU and hardware multiplier.
Test Condition, Active Mode, All Other Pins are Disconnected
Test Condition, Idle Mode, All Other Pins are Disconnected
0.45V
(1)
V
CC
- 0.5V
0.2 V
CC
0.7 V
CLOCK SIGNAL
CLOCK SIGNAL
Tests in Active and Idle Modes, t
CC
t
CHCL
- 0.1V
CC
GND
(NC)
GND
(NC)
OH
V
V
/V
DD
DD
OL
level occurs.
RST
POL
X T AL 2
X T AL 1
GND
RST
POL
X T AL 2
X T AL 1
GND
t
CHCX
V
V
DD
DD
t
CLCL
I
I
CC
CC
V
V
DD
DD
t
CLCH
CLCH
t
CHCX
(1)
= t
CHCL
= 5 ns
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