AT89C51ED2-RDRIM Atmel, AT89C51ED2-RDRIM Datasheet - Page 72
![IC MCU FLASH 8051 64K 5V 64-VQFP](/photos/6/81/68127/313-64-vqfp_sml.jpg)
AT89C51ED2-RDRIM
Manufacturer Part Number
AT89C51ED2-RDRIM
Description
IC MCU FLASH 8051 64K 5V 64-VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.ATWEBDVK-02RC.pdf
(137 pages)
Specifications of AT89C51ED2-RDRIM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
50
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
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
-
Other names
AT89C51ED2RDRIMTR
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17. Interrupt System
Figure 17-1. Interrupt Control System
72
AT89C51RD2/ED2
EXF2
KBD IT
SPI IT
INT0
INT1
PCA IT
TF0
TF1
TF2
RI
TI
The AT89C51RD2/ED2 has a total of 9 interrupt vectors: two external interrupts (INT0 and
INT1), three timer interrupts (timers 0, 1 and 2), the serial port interrupt, SPI interrupt, Keyboard
interrupt and the PCA global interrupt. These interrupts are shown in Figure 17-1.
Each of the interrupt sources can be individually enabled or disabled by setting or clearing a bit
in the Interrupt Enable register
disable bit, which must be cleared to disable all interrupts at once.
Each interrupt source can also be individually programmed to one out of four priority levels by
setting or clearing a bit in the Interrupt Priority register
High register
with each combination.
Individual Enable
(Table 17-5
IE0
IE1
and
IPH, IPL
Table
(Table 17-4
17-6) shows the bit values and priority levels associated
Global Disable
3
0
3
0
3
0
3
0
3
0
3
0
3
0
3
0
3
0
and
Table
17-6). This register also contains a global
(Table
17-7) and in the Interrupt Priority
High Priority
Interrupt
Interrupt
Polling
Sequence, Decreasing from
High to Low Priority
Low Priority
Interrupt
4235K–8051–05/08
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