7 uart and irda, Uart and irda -22, Uart and irda interface -22 – Motorola M68EZ328ADS User Manual
Page 23: Serial port pin assignment -22, Freescale semiconductor, i, Freescale semiconductor, inc
Hardware Description and Board Operation
MOTOROLA
M68EZ328ADS v2.0 USER’S MANUAL
3-22
3.7 UART AND IRDA
Figure 3-5 shows 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.
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).
MC68VZ328
TXD
RXD
CTS
RTS
Buffer
EN
EN
PD4
RS232 Transceiver
EN
VCC
GND
P9
S1-2
S1-1
IRDA
VCC
UART
Figure 3-5. UART and IRDA Interface.
1
2
3
4
5
6
7
8
9
TXD
RXD
CTS
RTS
GND
NC
NC
NC
NC
Figure 3-6. Serial Port Pin Assignment
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
ARCHIVED BY FREESCALE SEMICONDUCT
OR,
INC.
2005