AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 170

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

170
AT8xC5122/23
Table 107. Interrupt Enable Register - ISEL (S:A1h)
Reset Value = 0000 0000b
Number
CPLEV
Bit
7
6
5
4
3
2
1
0
7
Mnemonic
PRESEN
PRESIT
CPLEV
OELEV
OEEN
RXEN
RXIT
Bit
6
-
-
Description
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 change this bit.
Card presence detection interrupt flag
Set by hardware
Must be cleared by software
Received data interrupt flag
Set by hardware
Must be cleared by software
INT1 signal active level
Set this bit to indicate that high level is active.
Clear this bit to indicate that low level is active.
INT1 Interrupt Disable bit
Clear to disable INT1 interrupt
Set to enable INT1 interrupt
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.
Received data Interrupt Enable bit
Clear to disable the RxD interrupt.
Set to enable the RxD interrupt (a minimal bit width of 100 µs is required to
wake up from power-down) .
PRESIT
5
RXIT
4
OELEV
3
OEEN
2
PRESEN
1
4202D–SCR–06/05
RXEN
0