AT89C51ED2-SLRUM Atmel, AT89C51ED2-SLRUM Datasheet - Page 73
AT89C51ED2-SLRUM
Manufacturer Part Number
AT89C51ED2-SLRUM
Description
IC MCU FLASH 8051 64K 5V 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.ATWEBDVK-02RC.pdf
(137 pages)
Specifications of AT89C51ED2-SLRUM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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17.1
17.2
4235K–8051–05/08
Registers
Interrupt Sources and Vector Addresses
The PCA interrupt vector is located at address 0033H, the SPI interrupt vector is located at
address 004BH and Keyboard interrupt vector is located at address 003BH. All other vectors
addresses are the same as standard C52 devices.
Table 17-1.
A low-priority interrupt can be interrupted by a high priority interrupt, but not by another low-prior-
ity interrupt. A high-priority interrupt can’t be interrupted by any other interrupt source.
If two interrupt requests of different priority levels are received simultaneously, the request of
higher priority level is serviced. If interrupt requests of the same priority level are received simul-
taneously, an internal polling sequence determines which request is serviced. Thus within each
priority level there is a second priority structure determined by the polling sequence.
Table 17-2.
Number
10
0
1
2
3
4
5
6
7
8
9
IPH.x
Priority Level Bit Values
Interrupt Sources and Vector Addresses
0
0
1
1
Polling Priority
10
0
1
2
3
4
6
7
5
8
9
Interrupt Source
Keyboard
Timer 0
Timer 1
Timer 2
Reset
UART
INT0
INT1
PCA
SPI
-
IPL.x
0
1
0
1
CF + CCFn (n = 0 - 4)
TF2+EXF2
Interrupt
Request
KBDIT
RI+TI
SPIIT
TF0
AT89C51RD2/ED2
IE0
IE1
IF1
-
Interrupt Level Priority
3 (Highest)
0 (Lowest)
1
2
Address
Vector
000Bh
001Bh
002Bh
003Bh
004Bh
0000h
0003h
0013h
0023h
0033h
0043h
73
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