ST90135 datasheet(173/190 Pages) STMICROELECTRONICS

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ST90158 - EIGHT-CHANNEL ANALOG TO DIGITAL CONVERTER (A/D)

ANALOG TO DIGITAL CONVERTER (Cont’d)

INTERRUPT CONTROL REGISTER (AD_ICR)

R254 - Read/Write

Reset Value: 0000 1111 (0Fh)

Bit 7 = ECV:

End of Conversion.

This bit is set by hardware after a group of conver-

sions is completed. It must be reset by the user,

before returning from the Interrupt Service Rou-

tine. Setting this bit by software will cause a soft-

ware interrupt request to be generated.

0: No End of Conversion event occurred

1: An End of Conversion event occurred

Bit 6 = AWD:

Analog Watchdog.

This is automatically set by hardware whenever ei-

ther of the two monitored analog inputs goes out of

bounds. The threshold values are stored in regis-

ters F8h and FAh for channel 6, and in registers

F9h and FBh for channel 7 respectively. The Com-

pare Result Register (CRR) keeps track of the an-

alog inputs exceeding the thresholds.

The AWD bit must be reset by the user, before re-

turning from the Interrupt Service Routine. Setting

this bit by software will cause a software interrupt

request to be generated.

0: No Analog Watchdog event occurred

1: An Analog Watchdog event occurred

Bit 5 = ECI:

End of Conversion Interrupt Enable.

This bit masks the End of Conversion interrupt re-

quest.

0: Mask End of Conversion interrupts

1: Enable End of Conversion interrupts

Bit 4 = AWDI:

Analog Watchdog Interrupt Enable.

This bit masks or enables the Analog Watchdog

interrupt request.

0: Mask Analog Watchdog interrupts

1: Enable Analog Watchdog interrupts

Bit 3 = Reserved.

Bit 2:0 = PL[2:0]:

A/D Interrupt Priority Level.

These three bits allow selection of the Interrupt pri-

ority level for the A/D.

INTERRUPT VECTOR REGISTER (AD_IVR)

R255 - Read/Write

Reset Value: xxxx xx10 (x2h)

Bit 7:2 = V[7:2]:

A/D Interrupt Vector.

This vector should be programmed by the User to

point to the first memory location in the Interrupt

Vector table containing the starting addresses of

the A/D interrupt service routines.

Bit 1 = W1:

Word Select.

This bit is set and cleared by hardware, according

to the A/D interrupt source.

0: Interrupt source is the Analog Watchdog, point-

ing to the lower word of the A/D interrupt service

block (defined by V[7:2]).

1:Interrupt source is the End of Conversion inter-

rupt, thus pointing to the upper word.

Note: When two requests occur simultaneously,

the Analog Watchdog Request has priority over

the End of Conversion request, which is held

pending.

Bit 0 = Reserved. Forced by hardware to 0.

ECV

AWD

ECI

AWDI

PL2

PL1

PL0

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