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Special Control Register

EPM-4 Reference Manual Reference – 39

Special Control Register

SCR (READ/WRITE) 00E0h

D7 D6 D5 D4 D3 D2 D1 D0

Reserved Reserved SB-SEL Reserved Reserved Reserved Reserved GPI

Table 10: Special Control Register Bit Assignments

Bit Mnemonic Description

D7-D6 — Reserved — These bits have no function.

D5 SB-SEL BIOS Selector Input — Indicates the status of jumper V4[1-2]

SB-SEL = 0 Jumper V4 [1-2] = Out (Master BIOS)

SB-SEL = 1 Jumper V4 [1-2] = In (Run Time BIOS)

Note: This general purpose bit is read-only.

D4-D1 — Reserved — These bits have no function.

D0 GPI General Purpose Input — Indicates the status of TTL input

GPI = 0 Jumper V4 [3-4] = Out

GPI = 1 Jumper V4 [3-4] = In

Note: This bit is a read-only bit.

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 53

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