Zilog Z80195 - Manual (Page 13)

Z80185/195 D EVELOPMENT K IT
U SER ' S M ANUAL
2-5 UM951800100
Z ILOG
ESCC DTE Pinning on J10
Since the ESCC channel signals on the Z80185 are named appropriately for the DTE role, the
following signals on J10 are driven from (or received into) the pins of the same name on the ESCC
channel: TxD, RxD, RTS, CTS, DCD, DTR, and RxC.
DSR on J10 is received onto J14-8 (/DSR on the schematic). It can be jumpered to the 185’s PIA15
pin on J14-7, or PIA14 on J14-9.
TxC (DCE source) on J10 is received onto J7-1 (/TXCI on the schematic). It can be jumpered to ESCC
/TRXC on J7-2, in which case /TRXC should be programmed as an input.
The signal on J7-3 (/TXCO on the schematic) drives TxC (DTE source) on J10. It can be jumpered
from ESCC /TRXC on J7-2, in which case /TRXC should be programmed as an output.
ESCC DCE Pinning on J11
The ESCC signals on the Z80185 are named appropriately for the DTE role, so the connections on
J11 are backward:
The ESCC TxD output drives RxD on J11.
The ESCC RxD input is taken from TxD on J11.
The ESCC RTS output drives CTS on J11.
The ESCC CTS input is taken from RTS on J11.
The ESCC DTR output drives DSR on J11.
DTR on J11 is received onto J14-8 (/DSR on the schematic). It can be jumpered to the 185’s PIA15
pin on J14-7, or PIA14 on J14-9.
The signal on J14-10 (/DCDO on the schematic) drives DCD on J11. It can be jumpered from the 185’s
PIA14 pin on J14-9, or PIA12 on J14-11.
The ESCC RTXC input is taken from TxC (DTE source) on J11.
The signal on J7-3 (/TXCO on the schematic) drives both RxC and TxC (DCE source) on J11. It can
be jumpered from ESCC TRXC on J7-2.