Z85233 Datasheet, PDF (208/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

Application Note
The Zilog Datacom Family with the 80186 CPU
JUMPER SUMMARY
Table 12 includes only those connector blocks intended to actual connectors meant for use with cables, jumper wires,
be populated by 2-pin option jumpers. J1-J15 and J26 are or wire-wrapped connections.
8
Table 12. Two-Pin Option Jumpers
Jumpers
J9-J7 thru -9
Installed
7 to 8: 80186 SYSCLK is IUSC /RxC
7 to 9: 80186 SYSCLK is IUSC /TxC
J10-J7 thru -9
7 to 8: 80186 SYSCLK is MUSC (USC A) /RxC
7 to 9: 80186 SYSCLK is MUSC (USC A) /TxC
J12-J7 thru -9
7 to 8: 80186 SYSCLK is USC B /RxC
7 to 9: 80186 SYSCLK is USC B /TxC
J16-J1 thru -3
1 to 2: J3, J4 TxD driven when RTS
2 to 3: J3, J4 TxD, RTS driven full-time
J17-J1 to -2
J17-J3 thru -6
Unbalanced DCD- on J3 or J4
3 to 5 and 4 to 6: CTS+ on J4-J2
3 to 4 and 5 to 6: CTS- on J3 or J4
J18-J1 thru -3
1 to 2: 2764, 27128, 27256 EPROMs
2 to 3: 27512 EPROMs
J19-J1 thru -6
1 to 2 and 4 to 5: 128K x 8 SRAMs
2 to 3 and 5 to 6: 32K x 8 SRAMs
J20-J1 thru -3
1 to 2: U2 contains 80C30 or 80230
2 to 3: U2 contains 85C30 or 85230
J21-J1 thru -6
1 to 2 and 4 to 5: U2 contains 80C30 or 80230
2 to 3 and 5 to 6: U2 contains 85C30 or 85230
J22-J1 thru -4
1 to 2: MUSC (USC A) RxREQ on DMA 0
1 to 3: MUSC (USC A) RxREQ on DMA 1
2 to 4: MUSC (USC A) TxREQ on DMA 0
3 to 4: MUSC (USC A) TxREQ on DMA 1
J23-J1 thru -3
1 to 2: (E)SCC B RxRQ on DMA 0
2 to 3: (E)SCC B Wait function
J24-J1 thru -4
1 to 2: clipped SCC B TxREQ on DMA 1
1 to 3: direct ESCC B TxREQ on DMA 1
3 to 4: /DTR output from ESCC B
J25-J1 thru - 5 and J25X 1 to 2 and 3 to 4: (E)SCC last on IACK chain,
MUSC second to last
J25X to 2 and 3 to 4: (E)SCC last, USC 2nd to last
2 to 3 and 4 to 5: (E)SCC first on IACK chain
J28-J1 thru -6
1 to 2: 80186 SYSCLK is (E)SCC PCLK
3 to 4: 80186 SYSCLK is ISCC PCLK
5 to 6: 80186 SYSCLK is IUSC CLK
J29-J1 thru -4
1 to 2: USC B RxREQ on DMA 0
1 to 3: USC B RxREQ on DMA 1
2 to 4: USC B TxREQ on DMA 0
3 to 4: USC B TxREQ on DMA 1
Open
8: Something else on /RxC, or N/C
9: Something else on /TxC, or N/C
8: Something else on /RxC, or N/C
9: Something else on /TxC, or N/C
8: Something else on /RxC, or N/C
9: Something else on /TxC, or N/C
Must install one or the other
Differential DCD+, DCD- on J3
Differential CTS+, CTS- on J3
Must install one or the other
Must install one way or the other
Must install one way or the other
Must install one way or the other
1: MUSC (USC A) Rx no DMA
4: MUSC (USC A) Tx no DMA
(E)SCC B neither Rx DMA
nor Wait
(E)SCC B neither Tx DMA
nor /DTR
Must be one of these three ways
Connect some other clock to 2, 4, or 6
1: USC B Rx no DMA
4: USC B Tx no DMA
UM010901-0601
6-73