Zilog eZ80F92 Manual de usuario descargar pdf (Pagina 44)

eZ80F92 Development Kit

User Manual

eZ80Acclaim!

Development Platform UM013911-0607

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.

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 86 87

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Zilog eZ80F92 Manual de usuario Pagina 44

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