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PDF AT89C2051X2 Data sheet ( Hoja de datos )
| Número de pieza | AT89C2051X2 | |
| Descripción | 8-bit Microcontroller | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Compatible with MCS®-51 Products
• 2K Bytes of Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
• 2.7V to 6V Operating Range
• Fully Static Operation: 0 Hz to 16 MHz
• Two-level Program Memory Lock
• 128 x 8-bit Internal RAM
• 15 Programmable I/O Lines
• Two 16-bit Timer/Counters
• Six Interrupt Sources
• Programmable Serial UART Channel
• Direct LED Drive Outputs
• On-chip Analog Comparator
• Low-power Idle and Power-down Modes
• 6 Clocks per Machine Cycle Operation
Description
The AT89C2051x2 is a low-voltage, high-performance CMOS 8-bit microcontroller
with 2K bytes of Flash programmable memory. The device is manufactured using
Atmel’s high-density nonvolatile memory technology and is compatible with the indus-
try-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on
a monolithic chip, the Atmel AT89C2051x2 is a powerful microcomputer which pro-
vides a highly-flexible and cost-effective solution to many embedded control
applications.
The AT89C2051x2 provides the following standard features: 2K bytes of Flash, 128
bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt
architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator
and clock circuitry. In addition, the AT89C2051x2 is designed with static logic for oper-
ation down to zero frequency and supports two software selectable power saving
modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial
port and interrupt system to continue functioning. The power-down mode saves the
RAM contents but freezes the oscillator disabling all other chip functions until the next
hardware reset.
Furthermore, the AT89C2051x2 executes one machine cycle in 6 clock cycles, provid-
ing twice the speed of the AT89C2051 device. The user gains the flexibility to divide
input frequency crystals by 2 (using less expensive components), while keeping the
same CPU power. Alternatively, the user can save on power consumption while keep-
ing the same CPU power (oscillator power saving).
8-bit
Microcontroller
with 2K Bytes
Flash
AT89C2051x2
Pin Configuration
PDIP/SOIC
RST/VPP
(RXD) P3.0
(TXD) P3.1
XTAL2
XTAL1
(INT0) P3.2
(INT1) P3.3
(TO) P3.4
(T1) P3.5
GND
1
2
3
4
5
6
7
8
9
10
20 VCC
19 P1.7
18 P1.6
17 P1.5
16 P1.4
15 P1.3
14 P1.2
13 P1.1 (AIN1)
12 P1.0 (AIN0)
11 P3.7
Rev. 3285B–MICRO–10/03
1
1 page  
AT89C2051x2
Special
Function
Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown
in the table below.
Note that not all of the addresses are occupied, and unoccupied addresses may not be imple-
mented on the chip. Read accesses to these addresses will in general return random data,
and write accesses will have an indeterminate effect.
User software should not write 1s to these unlisted locations, since they may be used in future
products to invoke new features. In that case, the reset or inactive values of the new bits will
always be 0.
Table 1. AT89C2051x2 SFR Map and Reset Values
0F8H
0FFH
0F0H
0E8H
B
00000000
0F7H
0EFH
0E0H
0D8H
ACC
00000000
0E7H
0DFH
0D0H
0C8H
PSW
00000000
0D7H
0CFH
0C0H
0C7H
0B8H
0B0H
0A8H
0A0H
IP
XXX00000
P3
11111111
IE
0XX00000
0BFH
0B7H
0AFH
0A7H
98H SCON
00000000
90H P1
11111111
88H TCON
00000000
80H
SBUF
XXXXXXXX
TMOD
00000000
SP
00000111
TL0
00000000
DPL
00000000
TL1
00000000
DPH
00000000
TH0
00000000
TH1
00000000
9FH
97H
8FH
PCON 87H
0XXX0000
3285B–MICRO–10/03
5
5 Page 
AT89C2051x2
Flash Programming and Verification Characteristics
TA = 0°C to 70°C, VCC = 5.0 ± 10%
Symbol
Parameter
VPP
IPP
tDVGL
tGHDX
tEHSH
tSHGL
tGHSL
tGLGH
tELQV
tEHQZ
tGHBL
tWC
tBHIH
tIHIL
Note:
Programming Enable Voltage
Programming Enable Current
Data Setup to PROG Low
Data Hold after PROG
P3.4 (ENABLE) High to VPP
VPP Setup to PROG Low
VPP Hold after PROG
PROG Width
ENABLE Low to Data Valid
Data Float after ENABLE
PROG High to BUSY Low
Byte Write Cycle Time
RDY/BSY\ to Increment Clock Delay
Increment Clock High
1. Only used in 12-volt programming mode.
Flash Programming and Verification Waveforms
Min Max Units
11.5 12.5
V
250 µA
1.0 µs
1.0 µs
1.0 µs
10 µs
10 µs
1 110
µs
1.0 µs
0 1.0
µs
50 ns
2.0 ms
1.0 µs
200 ns
3285B–MICRO–10/03
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AT89C2051X2.PDF ] | |
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