Zilog EZ80F91 Manuel d'utilisateur télécharger pdf (Page 43)

eZ80F91 Development Kit

User Manual

UM014220-0508 eZ80 Development Kit

disabled if the RS-485 circuit is enabled. When the shunt is placed, the

RS-485 circuit is enabled. See Table 23.

Jumper J17

The J17 jumper connection controls the selection of the RS-485 termina-

tion resistor circuit. When the shunt is placed, the RS-485 termination

resistor circuit is enabled. See Table 24.

Jumper J18

The J18 jumper connection controls the selection of the RS-485 termina-

tion resistor circuit. When the shunt is placed, the RS-485 termination

resistor circuit is enabled. See Table 25.

Table 23. J16—RS485_2_EN

Shunt

Status Function Affected Device

IN The RS-485 circuit is enabled on UART1.

The UART1 MODEM interface and the

Socket Modem interface are disabled.

UART1 MODEM interface,

Socket Modem Interface, and

RS-485 interface.

OUT The RS-485 circuit is disabled on UART1. UART1 MODEM interface,

Socket Modem Interface, and

RS-485 interface.

Table 24. J17—RT_1*

Shunt

Status Function Affected Device

IN The Termination Resistor for RS485_1 is IN. RS-485 interface.

OUT The Termination Resistor for RS485_1 is OUT. RS-485 interface.

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

interface line.

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Zilog EZ80F91 Manuel d'utilisateur Page 43