AT83C51RB2-3CSCM データシートの表示（PDF） - Atmel Corporation

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AT83C51RB2-3CSCM

80C51 High Performance ROM 8-bit Microcontroller

Atmel Corporation 

Registers

AT80C51RD2/AT83C51Rx2

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.

Table 32. Priority Level Bit Values

IPH.x

IPL.x

Interrupt Level Priority

0

0

0 (Lowest)

0

1

1

1

0

2

1

1

3 (Highest)

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.

47

4113B–8051–03/05

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