ST62T18C datasheet(30/82 Pages) STMICROELECTRONICS

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ST62T18C/E18C

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 the ST62E18C/

T18C are summarized in the Table 10 with associ-

ated mask bit to enable/disable the interrupt re-

quest.

Table 10. 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

TSCR1

D4h

ETI

TMZ: TIMER Overflow

source 4

A/D CONVERTER

ADCR

D1h

EAI

EOC: End of Conversion

source 4

UART

UARTCR

D7h

RXIEN

TXIEN

RXRDY: Byte received

TXMT: Byte sent

source 4

ARTIMER

ARMC

E5h

OVIE

CPIE

EIE

OVF: ARTIMER Overflow

CPF: Successful compare

EF: Active edge on ARTIMin

source 3

SPI

SIDR

DCh

ALL

End of Transmission

source 1

Port PAn

ORPA-DRPA

C0h-C4h

ORPAn-DRPAn

PAn pin

source 1

Port PBn

ORPB-DRPB

C1h-C5h

ORPBn-DRPBn

PBn pin

source 2

Port PDn

ORPD-DRPD

C3h-C7h

ORPDn-DRPDn

PDn pin

source 2

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