Z85C3008VSG Datasheet, PDF (13/81 Pages) Zilog, Inc. – CMOS SCC Serial Communications Controller

CMOS SCC Serial Communications Controller
Product Specification
5
Pin Descriptions
The following links refer to descriptions of the pin functions common to the Z85C30 and
Z80C30 devices.
• CTSA, CTSB
• DCDA, DCDB
• DTR/REQA, DTR/REQB
• IEI
• IEO
• INT
• INTACK
• PCLK
• RxDA, RxDB
• RTxCA, RTxCB
• RTSA, RTSB
• SYNCA, SYNCB
• TxDA, TxDB
• TRxCA, TRxCB
• W/REQA, W/REQB
CTSA, CTSB
Clear To Send (inputs, active Low) . If these pins are programmed for Auto Enable
functions, a Low on the inputs enables the respective transmitters. If not programmed as
Auto Enable, these pins can be used as general-purpose inputs. Both inputs are Schmitt-
trigger buffered to accommodate slow rise-time inputs. The SCC detects pulses on these
inputs and can interrupt the CPU on both logic level transitions.
DCDA, DCDB
Data Carrier Detect (inputs, active Low) . These pins function as receiver enables if
programmed for Auto Enable. Otherwise, these pins are used as general-purpose input
PS011706-0511
Pin Descriptions