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PDF 89C51RE2 Data sheet ( Hoja de datos )

Número de pieza 89C51RE2
Descripción AT89C51RE2
Fabricantes ATMEL Corporation 
Logotipo ATMEL Corporation Logotipo



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Features
80C52 Compatible
– 8051 Instruction Compatible
– Four 8-bit I/O Ports (44 Pins Version)
– Three 16-bit Timer/Counters
– 256 bytes Scratch Pad RAM
– 11 Interrupt Sources With 4 Priority Levels
ISP (In-System Programming) Using Standard VCC Power Supply
Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply
Boot ROM Contains Serial Loader for In-System Programming
High-speed Architecture
– In Standard Mode:
40 MHz (Vcc 2.7V to 5.5V, Both Internal and External Code Execution)
60 MHz (Vcc 4.5V to 5.5V and Internal Code Execution Only)
– In X2 Mode (6 Clocks/Machine Cycle)
20 MHz (Vcc 2.7V to 5.5V, Both Internal and External Code Execution)
30 MHz (Vcc 4.5V to 5.5V and Internal Code Execution Only)
128K bytes On-chip Flash Program/Data Memory
– 128 bytes Page Write with auto-erase
– 100k Write Cycles
On-chip 8192 bytes Expanded RAM (XRAM)
– Software Selectable Size (0, 256, 512, 768, 1024, 1792, 2048, 4096, 8192 bytes)
Dual Data Pointer
Extended stack pointer to 512 bytes
Variable Length MOVX for Slow RAM/Peripherals
Improved X2 Mode with Independant Selection for CPU and Each Peripheral
Keyboard Interrupt Interface on Port 1
SPI Interface (Master/Slave Mode)
8-bit Clock Prescaler
Programmable Counter Array with:
– High Speed Output
– Compare/Capture
– Pulse Width Modulator
– Watchdog Timer Capabilities
Asynchronous Port Reset
Two Full Duplex Enhanced UART with Dedicated Internal Baud Rate Generator
Low EMI (inhibit ALE)
Hardware Watchdog Timer (One-time Enabled with Reset-Out), Power-Off Flag
Power Control Modes: Idle Mode, Power-down Mode
Power Supply: 2.7V to 5.5V
Temperature Ranges: Industrial (-40 to +85°C)
Packages: PLCC44, VQFP44
8-bit Flash
Microcontroller
AT89C51RE2

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89C51RE2 pdf
AT89C51RE2
Mnemonic
VSS
Vss1
VCC
P0.0-P0.7
P1.0-P1.7
P2.0-P2.7
P3.0-P3.7
Table 2. Pin Description
Pin Number
LCC
VQFP 1.4
22 16
39
44 38
43-36
37-30
2-9 40-44
1-3
2
3
4
5
6
7
8
9
24-31
40
41
42
43
44
1
2
3
18-25
11,
13-19
5,
7-13
11 5
13 7
14 8
Type
I
I
I
I/O
I/O
I/O
I
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
O
I
Name and Function
Ground: 0V reference
Optional Ground: Contact the Sales Office for ground connection.
Power Supply: This is the power supply voltage for normal, idle and power-down operation
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to them
float and can be used as high impedance inputs. Port 0 must be polarized to VCC or VSS in
order to prevent any parasitic current consumption. Port 0 is also the multiplexed low-order
address and data bus during access to external program and data memory. In this
application, it uses strong internal pull-up when emitting 1s. Port 0 also inputs the code bytes
during EPROM programming. External pull-ups are required during program verification
during which P0 outputs the code bytes.
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
Port 1 pins that are externally pulled low will source current because of the internal pull-ups.
Port 1 also receives the low-order address byte during memory programming and
verification.
Alternate functions for TSC8x54/58 Port 1 include:
T2 (P1.0): Timer/Counter 2 external count input/Clockout
T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control
ECI (P1.2): External Clock for the PCA
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
CEX2 (P1.5): Capture/Compare External I/O for PCA module 2
CEX3 (P1.6): Capture/Compare External I/O for PCA module 3
CEX4 (P1.7): Capture/Compare External I/O for PCA module 4
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
Port 2 pins that are externally pulled low will source current because of the internal pull-ups.
Port 2 emits the high-order address byte during fetches from external program memory and
during accesses to external data memory that use 16-bit addresses (MOVX @DPTR).In this
application, it uses strong internal pull-ups emitting 1s. During accesses to external data
memory that use 8-bit addresses (MOVX @Ri), port 2 emits the contents of the P2 SFR.
Some Port 2 pins receive the high order address bits during EPROM programming and
verification:
P2.0 to P2.5 for RB devices
P2.0 to P2.6 for RC devices
P2.0 to P2.7 for RD devices.
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s
written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs,
Port 3 pins that are externally pulled low will source current because of the internal pull-ups.
Port 3 also serves the special features of the 80C51 family, as listed below.
RXD_0 (P3.0): Serial input port
TXD_0 (P3.1): Serial output port
INT0 (P3.2): External interrupt 0
7663E–8051–10/08
5

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89C51RE2 arduino
AT89C51RE2
Table 11. SPI Controller SFRs
Mnemonic Add Name
SPCON
C3h SPI Control
SPSCR
C4h SPI Status
SPDAT
C5h SPI Data
7
SPR2
SPIF
SPD7
6
SPEN
SPD6
5
SSDIS
OVR
SPD5
4
MSTR
MODF
SPD4
3
CPOL
SPTE
SPD3
210
CPHA
SPR1
SPR0
UARTM SPTEIE MODFIE
SPD2
SPD1
SPD0
Table 12. Two-Wire Interface Controller SFRs
Mnemonic Add Name
7
SSCON
93h Synchronous Serial control
SSCR2
SSCS
94h Synchronous Serial Status
SSC4
SSDAT
95h Synchronous Serial Data
SSD7
SSADR
96h Synchronous Serial Address
SSA7
6
SSPE
SSC3
SSD6
SSA6
5
SSSTA
SSC2
SSD5
SSA5
4
SSSTO
SSC1
SSD4
SSA4
3
SSI
SSC0
SSD3
SSA3
2
SSAA
0
SSD2
SSA2
1
SSCR1
0
SSD1
SSA1
0
SSCR0
0
SSD0
SSGC
Table 13. Keyboard Interface SFRs
Mnemonic Add Name
KBLS
9Ch Keyboard Level Selector
KBE
9Dh Keyboard Input Enable
KBF
9Eh Keyboard Flag Register
7
KBLS7
KBE7
KBF7
6
KBLS6
KBE6
KBF6
5
KBLS5
KBE5
KBF5
4
KBLS4
KBE4
KBF4
3
KBLS3
KBE3
KBF3
2
KBLS2
KBE2
KBF2
1
KBLS1
KBE1
KBF1
0
KBLS0
KBE0
KBF0
7663E–8051–10/08
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