AT80C51RD2-3CSUM Atmel, AT80C51RD2-3CSUM Datasheet - Page 45

• Manufacturer Part Number: AT80C51RD2-3CSUM
• Description: IC, 8BIT MCU, 80C51, 40MHZ, DIP-40
• Manufacturer: Atmel

Specifications of AT80C51RD2-3CSUM

• Controller Family/series: 80C51
• No. Of I/o's: 32
• Ram Memory Size: 1280Byte
• Cpu Speed: 40MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 5
• Digital Ic Case Style: DIP
• Core Size: 8 Bit
• Rohs Compliant: Yes
• Processor Series: AT80x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: ROMLess
• Data Ram Size: 1280 B
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Package / Case: PDIL-40
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: 0 C
• Cpu Family: AT80
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 1.25KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 40
• Package Type: PDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12. Interrupt System
Figure 12-1. Interrupt Control System
12.1
4113D–8051–01/09
Registers
EXF2
KBD IT
INT0
INT1
PCA IT
TF0
TF1
TF2
RI
TI
The AT80C51RD2 have a total of 8 interrupt vectors: two external interrupts (INT0 and INT1),
three timer interrupts (timers 0, 1 and 2), the serial port interrupt, Keyboard interrupt and the
PCA global interrupt. These interrupts are shown in Figure 12-1.
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 also can 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.
The PCA interrupt vector is located at address 0033H, the Keyboard interrupt vector is located
at address 004BH. All other vectors addresses are the same as standard C52 devices.
Individual Enable
(Table 12-4
IE0
IE1
and
IPH, IPL
(Table 12-5
Table
12-5) 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
and
Table
12-3). This register also contains a global
(Table
12-6) and in the Interrupt Priority
High Priority
Interrupt
AT80C51RD2
Interrupt
Polling
Sequence, Decreasing from
High to Low Priority
Low Priority
Interrupt
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