AT89C51ED2-RDTIM datasheet(74/137 Pages) ATMEL

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AT89C51ED2-RDTIM датащи(PDF) 74 Page - ATMEL Corporation

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AT89C51RD2/ED2

4235E–8051–04/04

Registers

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 51. Priority Level Bit Values

A low-priority interrupt can be interrupted by a high priority interrupt, but not by another

low-priority 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 simultaneously, 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.

IPH.x

IPL.x

Interrupt Level Priority

0 (Lowest)

3 (Highest)

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