Zilog Z8F0411 Manual do Utilizador descarregar pdf (Página 55)

MDS General-Purpose Board Development Kit

User Manual

UM016905-1207 Appendix—MDS-PM Board Pin Maps

C Bus Expander U2 Signals For Serial Port Control

U2 is an I

C bus expander that can be used via software to control the

signals on jumper J2. If the U2 I

C expander is to be used, ensure all

jumpers are removed from J2. U2 powers up with all pins in input mode.

The U2 bus expander I

C address is 0100010 R/W.

•

GPS_ENABLE—D0 = 0

•

IrDA ENABLE—D1 = 0

•

RS485 ENABLE—D2 = 0

•

RS232_COM1_ENABLE—D3 = 0

•

RS232_COM2_ENABLE—D4 = 0

•

RF_ENABLE—D5 = 0

•

SW_UART_ENABLE—D6 = 0

•

Spare—D7

RS232-1 Signals

Enabled by jumper on J2 pins 1, 2, or by U2 pin D3. Uses COM1. When

enabled, disables RS485, IrDA, and RF.

•

TXD—PA5_TXD0

•

RXD—PA4_RXD0

•

CTS—PA3_CTS0 (Input)

•

RTS—PG0 (Software RTS0 Output)

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Zilog Z8F0411 Manual do Utilizador Página 55