Owner's manual

PB-DOUT8
Page 4 - 6
Software References
22 Oct 98Man. ID 17984, Rev. Index 0110
Legend:
“0” Read bit as “0”. This data bit is not used, write “0”:
MIE “Master interrrupt enable” bit:
“0” = board is not generating interrupt,
“1” = board is generating interrupt.
SI Sum of interrupts:
“0” = non of the 8 channels is generating an interrupt,
“1” = one or more of the 8 channels is generating an interrupt.
BUSI VMEbus interrupt:
If both SI and MIE are equal to “1” BUSI is set by the Hardware Logic and an inter-
rupt request is sent to the carrier board on which your PB-DOUT8 is installed.
Thus, BUSI directly represents the status of the PB-DOUT8 IRQ line.
Inside the interrupt service routine, the MIE bit must be written with “0”. The BUSI
bit will be cleared by the Hardware and the PB-DOUT8 interrupt request will be
cleared.
After handling all error flags of all high side switches, the SI flag will be reset to “0”
by the PB-DOUT8 logic.
To enable further interrupt in case of any errors, the application interrupt service
routine needs to write a “1” to the MIE bit.
IV7..3Programmable interrupt vector:
IV7...3 can be programmed, IV2...IV0 cannot be programmed and are preset to
“1”. IV7...IV0 are equal to $0F after reset.
4.4 Error Analysis
The PB-DOUT8 output module supports the following diagnostics modes:
• External power supply ON/OFF
• Overtemperature
• Short circuit to GND
• Short circuit to VCC
• Open load
• Undervoltage detection
• Overvoltage detection
Table 4-2: IRQ Control Register ($77)
MSB Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB
Read IV7 IV6 IV5 IV4 IV3 BUSI SI MIE
Write IV7 IV6 IV5 IV4 IV3 BUSI SI MIE
Reset 0 0 0 0 0 0 0 0