ST6242 datasheet(28/68 Pages) STMICROELECTRONICS

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ST62T42B/E42B

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

the

ST62E42B/T42B are summarized in the Table 12

with associated mask bit to enable/disable the in-

terrupt request.

Table 12. Interrupt Requests and Mask Bits

LES

ESB

GEN

Peripheral

Address

Mask bit

Masked Interrupt Source

Interrupt

source

GENERAL

IOR

C8h

GEN

All Interrupts, excluding NMI

All

TIMER 1

TIMER 2

TSCR1

TSCR2

D4h

D7h

ETI

TMZ: TIMER Overflow

source 3

A/D CONVERTER

ADCR

D1h

EAI

EOC: End of Conversion

source 4

SPI

C2h

ALL

End of Transmission

source 1

Port PAn

ORPA-DRPA

C0h-C4h

ORPAn-DRPAn

PAn pin

source 2

Port PBn

ORPB-DRPB

C1h-C5h

ORPBn-DRPBn

PBn pin

source 2

Port PCn

ORPC-DRPC

C6h-CFh

ORPCn-DRPCn

PCn pin

source 2

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