Register Summary
VL-586-1 Reference Manual
Register Descriptions
–
59
S
PECIAL
C
ONTROL
R
EGISTER
SCR (READ/WRITE) 00E0H
D7
D6
D5
D4
D3
D2
D1
D0
LED
Reserved
GP0
IPC
Reserved
Reserved
PM
WDOGEN
Table 39: Special Control Register Bit Assignments
Bit
Mnemonic
Description
D7
LED
Light Emitting Diode
— Controls the on-board LED.
LED = 0
Turns LED off.
LED = 1
Turns LED on.
D6
—
Reserved
— This bit has no function. Always reads as 0.
D5
GP0
General Purpose Jumper Input
— This bit reflects the state of jumper V19[1-2].
GP0 = 0
Jumper out.
GP0 = 1
Jumper in.
D4
IPC
Interprocessor Communication
— Used to signal the attention of other CPU
cards in a multiprocessor environment. IPC controls an open collector signal,
TIPC*. Jumper block V17 configures the TIPC* signal to be carried on the STD
Bus signal INTRQ* (P44). As an alternative, TIPC* can be carried on the STD
Bus signal INTRQ4 (P05). An active low signal on this circuit (generated locally
by writing a 0 to this bit, or received from the STD Bus) requests an interrupt on
IRQ5. In DOS configuration, this causes an INT 0Dh resulting in a dispatch
through the interrupt vector at 0000:0034h.
IPC = 0
TIPC* released for other cards to drive.
IPC = 1
TIPC* signal is driven active low.
D3
—
Reserved
— This bit has no function. Always reads as 0.
D2
—
Reserved
— This bit has no function. Always reads as 0.
D1
PM
Permanent Master
— This status bit reflects the state of jumper V18[7-8].
Writing to this bit has no effect.
PM* = 0
Jumper out.
PM* = 1
Jumper in.
D0
WDOGEN
Watchdog Enable
— Enables and disables the watchdog timer reset circuit.
WDOGEN = 0
Disables the watchdog timer.
WDOGEN = 1
Enables the watchdog timer.
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