Zilog eZ80F92 User Manual
Page 44
eZ80F92 Development Kit
User Manual
eZ80Acclaim!
®
Development Platform
UM013911-0607
40
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 Table 22.
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 23.
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.