7 Special Circuit Description
SAM4S ER-5200 Series
7-7
7-5 RS-232C & IRC Communication Block Diagram
The CPU is used for serial communication 1,2. And also RS-232C Driver(MAX232), is used to serial communication.
Show following block diagram
Figure 7-11 RS-232C and IRC Communication Block Diagram
Figure 7-12 RS-232C Waveform
CONTROL SIGNAL
SERIAL I/F PBA
CPU
M306800SFP
D-SUB9
D-SUB9
Modular
SERIAL COM1
MAX232
DRIVER
MAX232
DRIVER
IRC
DRIVER
SERIAL COM2
TXD1,RXD1,DTR1,DSR1
TXD2,RXD2,DTR2,DSR2
T/RXD+,T/RXD-
TRANSMIT ACTION(ECR)
RECEIVE ACTION(ECR)
HOST BUSY
ECR checks whether the host is BUSY.
ECR transmits a data
HOST NOT BUSY
RXD(
←
)
PC
ECR
DTR(
→
)
DSR
TXD
HOST BUSY
ECR BUSY
HOST checks whether the ECR is BUSY.
HOST transmits a data
ECR NOT BUSY
TXD(
→
)
PC
ECR
DSR(
←
)
DTR
RXD
ECR BUSY
Note :
This is a RS232C H/W Handshaking Waveform between ECR and PC.
RS-232C H/W Handshaking method is different between ECR and other peripheral and terminal equipment.
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