AT89LV55-12AI Atmel, AT89LV55-12AI Datasheet - Page 6

• Manufacturer Part Number: AT89LV55-12AI
• Description: IC 8051 MCU FLASH 20K 44TQFP
• Manufacturer: Atmel
• Series: 89LVr

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

4.10
4.11
4.12
5. Special Function Registers
Table 5-1.
6
0D8H
0D0H
0C8H
0C0H
0F8H
0F0H
0E8H
0E0H
0B8H
0B0H
0A8H
0A0H
98H
90H
88H
80H
EA/V
XTAL1
XTAL2
AT89LV55
XX000000
00000000
00000000
00000000
00000000
11111111
0X000000
11111111
00000000
11111111
00000000
11111111
T2CON
SCON
TCON
PSW
ACC
P3
P2
P1
P0
IP
IE
B
PP
AT89LV55 SFR Map and Reset Values
XXXXXXXX
XXXXXX00
00000000
00000111
T2MOD
TMOD
SBUF
External Access Enable. EA must be strapped to GND in order to enable the device to fetch
code from external program memory locations starting at 0000H up to FFFFH. Note, however,
that if lock bit 1 is programmed, EA will be internally latched on reset.
EA should be strapped to V
This pin also receives the 12-volt programming enable voltage (V
programming.
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
Output from the inverting oscillator amplifier.
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in
Table
SP
5-1.
00000000
00000000
00000000
RCAP2L
DPL
TL0
00000000
00000000
00000000
RCAP2H
DPH
TL1
CC
for internal program executions.
00000000
00000000
TH0
TL2
00000000
00000000
TH2
TH1
PP
) during 12-volt Flash
0XXX0000
PCON
0811E–MICRO–9/08
0FFH
0EFH
0E7H
0DFH
0D7H
0CFH
0C7H
0BFH
0B7H
0AFH
0A7H
0F7H
9FH
97H
8FH
87H