Rainbow Electronics AT89C5122 - Manual (Page 163)

163
AT8xC5122/23
4202E–SCR–06/06
Reset Value = X0XX 00X0b (Bit addressable)
Table 99. Interrupt Enable Register 1 - IEN1 (B1h) for AT8xC5122
7 6 5 4 3 2 1 0
- EUSB - - ESCI ESPI - EKB
Bit
Number
Bit
Mnemonic Description
7 -
Reserved
The value read from this bit is indeterminate. Do not change this bit.
6 EUSB
USB Interrupt Enable bit
Cleared to disable USB interrupt .
Set to enable USB interrupt.
5 - 4 -
Reserved
The value read from this bit is indeterminate. Do not change these bits.
3 ESCI
SCI interrupt Enable bit
Cleared to disable SCIinterrupt .
Set to enable SCI interrupt.
2 ESPI
SPI interrupt Enable bit
Cleared to disable SPI interrupt .
Set to enable SPI interrupt.
1 -
Reserved
The value read from this bit is indeterminate. Do not change this bit.
0 EKB
Keyboard interrupt Enable bit
Cleared to disable keyboard interrupt .
Set to enable keyboard interrupt.