Intel 386

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
5-16
Figure 5-9. Serial I/O Unit 1 Configuration
A2519-02
BCLKIN
Receive Data
Transmit Data
Request to Send
SIO1
Clear to Send
Data Set Ready
Data Terminal
Ready
Data Carrier
Detect
Ring Indicator
0
1
COMCLK
(P3.7)†
To/From I/O Port 3
P3CFG.7
SERCLK
SIOCFG.1
† Alternate pin signals are in parentheses.
RXD1
(DRQ1)
To DMA
TXD1
(DACK1#)
From DMA
PINCFG.2
0
1
CTS1#
(EOP#)
SIOCFG.7
To/From DMA
RTS1#
(SSIOTX)
From SSIO
PINCFG.0
0
1
DSR1#
(STXCLK)
To/From SSIO
0
1
DCD1#
(DRQ0)
To DMA
PINCFG.3
DTR1#
(SRXCLK)
To/From SSIO
PINCFG.1
0
1
RI1#
(SSIORX)
To SSIO
V
CC
To DMA
TXEDMA1
To ICU
SIOINT1
To DMA
RBFDMA1
1
0
1
0
1
0
1
0
1
0