Rainbow Electronics AT89C5122 - Manual (Page 164)

164
AT8xC5122/23
4202E–SCR–06/06
Reset Value = X0XX 0XXXb (Bit addressable)
Reset Value = X000 0000b (Bit addressable)
Table 100. Interrupt Enable Register 1 - IEN1 (B1h) for AT83C5123
7 6 5 4 3 2 1 0
- EUSB - - ESCI -
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
Reserved
The value read from this bit is indeterminate. Do not change this bit.
1 -
Reserved
The value read from this bit is indeterminate. Do not change this bit.
0
Reserved
The value read from this bit is indeterminate. Do not change this bit.
Table 101. Interrupt Priority Low Register 0 - IPL0 (B8h)
7 6 5 4 3 2 1 0
- - - PSL PT1L PX1L PT0L PX0L
Bit
Number
Bit
Mnemonic Description
7 - 5 -
Reserved
The value read from this bit is indeterminate. Do not change these bits.
4 PSL
Serial port Priority bit
Refer to PSH for priority level.
3 PT1L
Timer 1 overflow interrupt Priority bit
Refer to PT1H for priority level.
2 PX1L
External interrupt 1 Priority bit
Refer to PX1H for priority level.
1 PT0L
Timer 0 overflow interrupt Priority bit
Refer to PT0H for priority level.
0 PX0L
External interrupt 0 Priority bit
Refer to PX0H for priority level.