Energy Meter IC Family Software Instruction Manual

71M652X Software User’s Guide

Revision 1.7 TERIDIAN Proprietary 133 of 138

External interrupt 1

External interrupt 3

Timer 1 interrupt

External interrupt 4

UART 0 interrupt

External interrupt 5

External interrupt 6

Table 6-59: Polling Sequence

6.3.5.5 Interrupt Sources and Vectors

The vectors associated with each interrupt source are displayed in Table 6-59.

Interrupt Request Flags Interrupt Vector

Address

IE0 – External interrupt 0 0003H

TF0 – Timer 0 interrupt 000BH

IE1 – External interrupt 1 0013H

TF1 – Timer 1 interrupt 001BH

RI0/TI0 – UART 0 interrupt 0023H

RI1/TIi1 – UART 1 interrupt 0083H

IEX2 – External interrupt 2 004BH

IEX3 – External interrupt 3 0053H

IEX4 – External interrupt 4 005BH

IEX5 – External interrupt 5 0063H

IEX6 – External interrupt 6 006BH

Table 6-60: Interrupt Vectors

External Interrupt Edge Detect

The external interrupts 4, 5 and 6 are activated by a positive transition. The external source must hold the request pin

low (high for int2 and int3, if it is programmed to be negative transition-active) for at least one MPU clock period.

Afterwards, it must be held high (low) for at least one MPU clock period to ensure the transition is recognized and the

corresponding interrupt request flag is set.