AT89LV55-12AI Atmel, AT89LV55-12AI Datasheet - Page 10
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AT89LV55-12AI
Manufacturer Part Number
AT89LV55-12AI
Description
IC 8051 MCU FLASH 20K 44TQFP
Manufacturer
Atmel
Series
89LVr
Datasheet
1.AT89LV55-12AI.pdf
(32 pages)
Specifications of AT89LV55-12AI
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
44-TQFP, 44-VQFP
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 bit
Operating Supply Voltage
2.7 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
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:
AT89LV55-12AI
Manufacturer:
PHILIPS
Quantity:
12
Figure 8-2.
Table 8-2.
10
T2MOD Address = 0C9H
Not Bit Addressable
Symbol
–
T20E
DCEN
Bit
AT89LV55
–
7
Timer 2 Auto Reload Mode (DCEN = 0)
T2MOD—Timer 2 Mode Control Register
Function
Not implemented, reserved for future use.
Timer 2 Output Enable bit.
When set, this bit allows Timer 2 to be configured as an up/down counter.
–
6
A logic 0 at T2EX makes Timer 2 count down. The timer underflows when TH2 and TL2 equal
the values stored in RCAP2H and RCAP2L. The underflow sets the TF2 bit and causes 0FFFFH
to be reloaded into the timer registers.
The EXF2 bit toggles whenever Timer 2 overflows or underflows and can be used as a 17th bit
of resolution. In this operating mode, EXF2 does not flag an interrupt.
–
5
–
4
–
3
–
2
Reset Value = XXXX XX00B
T20E
1
DCEN
0811E–MICRO–9/08
0