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Table 3-1. CM7000 Interface Signals (concluded)
Signal
Name
Direction
Description
VBAT
In
Battery voltage. Connects to the ADM691 supervisor.
Must be grounded if no battery installed.
VRAM
Out
Battery-backed supply voltage for RAM, real-time
clock, and other devices.
PFI
In
Power failure input. Connects to the ADM691
supervisor, which generates a nonmaskable interrupt
(NMI) when this line falls below 1.3 V ± 0.05 V.
/RESET
Bi.
System reset. Driven by the ADM691 supervisor.
Must be pulled up when supervisor is not installed.
E
Out
6800-compatible timing reference. Directly connected
to Z180. TTL/CMOS compatible.
38 s System Development
CM7000