Zilog EZ80F91 Manual de usuario descargar pdf (Pagina 44)

eZ80F91 Development Kit

User Manual

UM014220-0508 eZ80 Development Kit

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 26.

Table 25. J18—RT_2*

Shunt

Status Function Affected Device

IN The Termination Resistor for RS485_2 is IN. RS-485 interface.

OUT The Termination Resistor for RS485_2 is OUT. RS-485 interface.

Note: *Before enabling the termination resistor, ensure that the device is located at the end of the

interface line.

Table 26. 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 ... 77 78

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Zilog EZ80F91 Manual de usuario Pagina 44