59629855202VZC View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

59629855202VZC

RadHard MicroController

Aeroflex UTMC 

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

INT3

INT6

INT4

INT7

NU

External Interrupt 3

External Interrupt 6

External Interrupt 4

External Interrupt 7

Not Used*

*Note:

The UT69R000 interrupt control hardware is designed such that the following sequence always occurs:

The machine will vector to the lowest priority interrupt (vector 43Chex) if interrupts are disabled after an interrupt is latched into

the PI register. Interrupts are latched into the PI register on the falling edge of STATE1, interrupts are disabled on the falling edge

of clock CK1 internal (rising edge of CK2). The UT69R000 vectors to address 43C (hex) during the fetch cycle of the command

following the disable command.

Work Around: Vector 43C hex is not used as a normal interrupt; instead it is used to store the interrupt that occurred coincident

with disabling of interrupts. The coincident interrupt is serviced after the interrupts are re-enabled by software.

43C:

PSEUDO:

INR RD, ICS

JC x, PSEUDO

NOP

INR RD, PI

OTR RD, RPI

OTR RD, PI

CALL RD, RD

; read PI

:clear PI

;reset PI register, saves coincident interrupt

;return

The interrupt service routine saves the interrupt that was coincident with the disable interrupt instruction. The UT69R000 will vector

to that interrupt after interrupts are re-enabled. The interrupt service routine (@43C) does not affect the condition code flags.

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