Z85C3008VSG Datasheet, PDF (17/81 Pages) Zilog, Inc. – CMOS SCC Serial Communications Controller

CMOS SCC Serial Communications Controller
Product Specification
9
CE
Chip Enable (input, active Low) . This signal selects the SCC for a Read or Write opera-
tion
D7–D0
Data Bus (bidirectional, tri-state) . These lines carry data and command to and from the
SCC.
D/C
Data/Control Select (input) . This signal defines the type of information transferred to or
from the SCC. A High indicates a data transfer; a Low indicates a command.
RD
Read (input, active Low) . This signal indicates a Read operation and when the SCC is
selected, enables the SCC’s bus drivers. During the Interrupt Acknowledge cycle, this sig-
nal gates the interrupt vector onto the bus if the SCC is the highest priority device request-
ing an interrupt.
WR
Write (input, active Low) . When the SCC is selected, this signal indicates a Write oper-
ation. The coincidence of RD and WR is interpreted as a reset.
Z80C30
The following links refer to descriptions of the pin functions specific to the Z80C30
device.
• AD7–AD0
• AS
• CS0
• CS1
• DS
• R/W
PS011706-0511
Pin Descriptions