ST6253C datasheet(32/83 Pages) STMICROELECTRONICS

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ST6253C ST6263C ST6263B ST6260C ST6260B

INTERRUPTS (Cont’d)

3.4.3 Interrupt Option Register (IOR)

The Interrupt Option Register (IOR) is used to en-

able/disable the individual interrupt sources and to

select the operating mode of the external interrupt

inputs. This register is write-only and cannot be

accessed by single-bit operations.

Address: 0C8h

—

Write Only

Reset status: 00h

Bit 7, Bits 3-0 = Unused.

Bit 6 = LES: Level/Edge Selection bit.

When this bit is set to one, the interrupt source #1

is level sensitive. When cleared to zero the edge

sensitive mode for interrupt request is selected.

Bit 5 = ESB: Edge Selection bit.

The bit ESB selects the polarity of the interrupt

source #2.

Bit 4 = GEN: Global Enable Interrupt. When this bit

is set to one, all interrupts are enabled. When this

bit is cleared to zero all the interrupts (excluding

NMI) are disabled.

When the GEN bit is low, the NMI interrupt is ac-

tive but cannot cause a wake up from STOP/WAIT

modes.

This register is cleared on reset.

3.4.4 Interrupt sources

Interrupt sources available on these MCUs are

summarized in the Table 9 with associated mask

bit to enable/disable the interrupt request.

Table 9Interrupt Requests and Mask Bits

LES

ESB

GEN

Peripheral

Address

Mask bit

Masked Interrupt Source

Interrupt

vector

GENERAL

IOR

C8h

GEN

All Interrupts, excluding NMI

TIMER

TSCR1

D4h

ETI

TMZ: TIMER Overflow

Vector 4

A/D CONVERTER

ADCR

D1h

EAI

EOC: End of Conversion

Vector 4

AR TIMER

ARMC

D5h

OVIE

CPIE

EIE

OVF: AR TIMER Overflow

CPF: Successful compare

EF: Active edge on ARTIMin

Vector 3

SPI

SPIMOD

E2h

SPIE

SPRUN: End of Transmission

Vector 2

Port PAn

ORPA-DRPA

C0h-C4h

ORPAn-DRPAn

PAn pin

Vector 1

Port PBn

ORPB-DRPB

C1h-C5h

ORPBn-DRPBn

PBn pin

Vector 1

Port PCn

ORPC-DRPC

C2h-C6h

ORPCn-DRPCn

PCn pin

Vector 2

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