Zilog EZ80F91 - Manual (Page 42)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
37
Jumper J14
The J14 jumper connection controls the polarity of the Ring Indicator. See
Table 21 .
Jumper J15
The J15 jumper connection controls the selection RS-485 circuit along
with UART0. When the shunt is placed, the RS-485 circuit is enabled.
See
Table 22 . RS-485 functionality will be available in future eZ80
®
devices.
Jumper J16
The J16 jumper connection controls the selection of the RS-485 circuit.
However, UART1 MODEM interface and the socket modem interface are
Table 21. J14—RI
Shunt Status Function Affected Device
1–2 The Ring Indicator for UART1 is inverted. UART1
2–3 The Ring Indicator for UART1 is not
inverted. UART1
Table 22. J15—RS485_1_EN*
Shunt
Status
Function Affected Device
IN The RS-485 circuit is enabled on UART0.
The UART0 CONSOLE interface and IrDA are
disabled.
IrDA, UART0 CONSOLE
interface, RS-485 interface.
OUT The RS-485 circuit is disabled on UART0. IrDA, UART0 CONSOLE
interface, RS-485 interface.
Note: *To enable the RS-485 circuit, the corresponding IrDA/RS-232 circuit must be disabled.