AT89LV55-12PI Atmel, AT89LV55-12PI Datasheet - Page 13
![IC 8051 MCU FLASH 20K 40DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
AT89LV55-12PI
Manufacturer Part Number
AT89LV55-12PI
Description
IC 8051 MCU FLASH 20K 40DIP
Manufacturer
Atmel
Series
89LVr
Datasheet
1.AT89LV55-12AI.pdf
(32 pages)
Specifications of AT89LV55-12PI
Core Processor
8051
Core Size
8-Bit
Speed
12MHz
Connectivity
UART/USART
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)
2.7 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
UART
Maximum Clock Frequency
12 MHz
Number Of Programmable I/os
32
Number Of Timers
3 x 16 bit
Operating Supply Voltage
2.7 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Peripherals
-
Lead Free Status / Rohs Status
No
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LV55-12PI
Manufacturer:
SyncMOS
Quantity:
5 000
Part Number:
AT89LV55-12PI
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Figure 9-1.
10. Programmable Clock Out
11. UART
0811E–MICRO–9/08
Timer 2 in Clock-out Mode
A 50% duty cycle clock can be programmed to come out on P1.0, as shown in
pin, besides being a regular I/O pin, has two alternate functions. It can be programmed to input
the external clock for Timer/Counter 2 or to output a 50% duty cycle clock ranging from 61 Hz to
3 MHz at a 12 MHz operating frequency.
To configure the Timer/Counter 2 as a clock generator, bit C/T2 (T2CON.1) must be cleared and
bit T2OE (T2MOD.1) must be set. Bit TR2 (T2CON.2) starts and stops the timer.
The clock-out frequency depends on the oscillator frequency and the reload value of Timer 2
capture registers (RCAP2H, TCAP2L), as shown in the following equation:
In the clock-out mode, Timer 2 roll-overs will not generate an interrupt. This behavior is similar to
when Timer 2 is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate gen-
erator and a clock generator simultaneously. Note, however, that the baud-rate and clock-out
frequencies cannot be determined independently from one another since they both use
RCAP2H and RCAP2L.
The UART in the AT89LV55 operates the same way as the UART in the AT89C51. For further
information on the UART operation, please click on the document link below:
http://www.atmel.com/dyn/resources/prod_documents/DOC4316.PDF
Clock-Out Frequency
=
------------------------------------------------------------------------------------------ -
4
×
[
65536
Oscillator Frequency
–
(
RCAP2H RCAP2L
,
)
]
AT89LV55
Figure
9-1. This
13