AT89C5121 datasheet(21/115 Pages) ATMEL

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A/T8xC5121

4164G–SCR–07/06

Table 6. ISEL Register

ISEL (S:BAh)

Interrupt Enable Register

Reset Value = 0X00 0000b

CPLEV

RXIT

PRESIT

OELEV

OEEN

RXEN

PRESEN

Bit

Number

Bit

Mnemonic

Description

CPLEV

Card presence detection level

This bit indicates which CPRES level will bring about an interrupt

Set this bit to indicate that Card Presence IT will appear if CPRES is at high

level.

Clear this bit to indicate that Card Presence IT will appear if CPRES is at low

level.

Reserved

The value read from this bit is indeterminate. Do not set this bit.

PRESIT

Card presence detection interrupt flag

Set by hardware

Must be cleared by software

4RXIT

Received data interrupt flag

Set by hardware

Must be cleared by software

OELEV

OE/INT1 signal active level

Set this bit to indicate that high level is active.

Clear this bit to indicate that low level is active.

2OEEN

OE/INT1 interrupt disable bit

Clear to disable INT1 interrupt

Set to enable INT1 interrupt

PRESEN

Card presence detection interrupt enable bit

Clear to disable the card presence detection interrupt coming from SCIB.

Set to enable the card presence detection interrupt coming from SCIB.

0RXEN

Received data Interrupt enable bit

Clear to disable the RxD interrupt.

Set to enable the RxD interrupt

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