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Z85C3010VSG Datasheet, PDF (17/83 Pages) Zilog, Inc. – CMOS SCC Serial Communications Controller
CMOS SCC Serial Communications Controller
Product Specification
9
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 opera-
tion. 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
AD7–AD0
Address/Data Bus (bidirectional, active High, Tri-state) . These multiplexed lines
carry register addresses to the SCC as well as data or control information.
PS011707-1013
Pin Descriptions