Owner's manual

A/T8xC5121

4164G–SCR–07/06

Table 35. ISEL Register

Reset Value = 0000 0100b

76543210

CPLEV OEIT PRESIT RXIT OELEV OEEN PRESEN RXEN

Bit

Number

Bit

Mnemonic Description

7 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.

5 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

3 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

1 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 (a minimal bit width of 0.1 ms is required to

wake up from Power-Down).