Zilog EZ80L92 User Manual
Page 43
eZ80L92 Development Kit
User Manual
UM012913-0407
Operational
Description
39
Jumper J18
The J18 jumper connection controls the selection of the RS485 termina-
tion resistor circuit. When the shunt is placed, the RS485 termination
resistor circuit is enabled. See
.
Jumper J19
The J19 jumper connection selects the range of memory addresses for the
external chip select signal, CS_EX, to the application module. See
Table 22. J18—RT_2*
Shunt
Status
Function
Affected Device
IN
The Termination Resistor for RS485_2 is IN.
RS485 interface.
OUT
The Termination Resistor for RS485_2 is OUT.
RS485 interface.
Note: *Before enabling the termination resistor, ensure that the device is located at the end of the
interface line.
Table 23. J19—EX_SEL
Shunt
Status
Function
Affected Device
1–2
CS_EX is decoded in the CS0 memory space and is
located in the address range 400000h–7FFFFFh.
Application module
addressing.
3–4
CS_EX is decoded in the CS2 memory space and is
located in the address range A00000h–A7FFFFh.
Application module
addressing.
5–6
CS_EX is decoded in the CS2 memory space and is
located in the address range A80000h–AFFFFFh.
Application module
addressing.
7–8
CS_EX is decoded in the CS2 memory space and is
located in the address range B00000h–B7FFFFh.
Application module
addressing.