Motorola M68EZ328ADS user manual Uart and Irda, MC68VZ328

Freescale Semiconductor, Inc.

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Freescale Semiconductor, Inc.

Hardware Description and Board Operation

3.7 UART AND IRDA

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

MC68VZ328
	RS232 Transceiver	VCC
		P9
TXD
RXD		UART
RTS
CTS	EN
	VCC	S1-1
	Buffer	IRDA
		GND
	EN
	S1-2
PD4	EN

Figure 3-5. UART and IRDA Interface.

Figure 3-5shows the UART and IRDA module. The M68EZ328ADS v2.0 has one RS232 serial ports P9. P9 is using the UART of MC68EZ328. It is 9-pin female D-Type connectors containing the signals as shown in Figure 3-6.The transceivers for UART can be enabled by turning the DIP switch S1-1 on.

NC	1	6	NC
TXD	2
		7
RXD	3		CTS
		8
NC	4		RTS
		9	NC
GND	5

Figure 3-6. Serial Port Pin Assignment

The IrDA transceiver is provided and connected to DragonBall’s UART Port only with a buffer in between for controlling its ON/OFF. If IrDA is being used, S1-1 should be switched OFF and S1-2 should be switched ON. Then, the enable/disable of IRDA is totally controlled by software through PD4 (Port D4).

MOTOROLAM68EZ328ADS v2.0 USER’S MANUAL3-22

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