13-16
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
UART3 Ch.
n
Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
UART3_
n
CTL
15
–
8
–
0x00
–
R
–
7
–
2
–
0x00
–
R
1
SFTRST
0
H0
R/W
0
MODEN
0
H0
R/W
Bits 15
–
2
Reserved
Bit 1
SFTRST
This bit issues software reset to the UART3.
1 (W): Issue software reset
0 (W): Ineffective
1 (R): Software reset is executing.
0 (R): Software reset has finished. (During normal operation)
Setting this bit resets the UART3 transmit/receive control circuit and interrupt flags. This
bit is automatically cleared after the reset processing has finished.
Bit 0
MODEN
This bit enables the UART3 operations.
1 (R/W): Enable UART3 operations (The operating clock is supplied.)
0 (R/W): Disable UART3 operations (The operating clock is stopped.)
Note:
If the UART3_
n
CTL.MODEN bit is altered from 1 to 0 while sending/receiving data, the data being
sent/received cannot be guaranteed. When setting the UART3_
n
CTL.MODEN bit to 1 again after that,
be sure to write 1 to the UART3_
n
CTL.SFTRST bit as well.
UART3 Ch.
n
Transmit Data Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
UART3_
n
TXD
15
–
8
–
0x00
–
R
–
7
–
0
TXD[7:0]
0x00
H0
R/W
Bits 15
–
8
Reserved
Bits 7
–
0
TXD[7:0]
Data can be written to the transmit data buffer through these bits. Make sure the
UART3_
n
INTF. TBEIF bit is set to 1 before writing data.
UART3 Ch.
n
Receive Data Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
UART3_
n
RXD
15
–
8
–
0x00
–
R
–
7
–
0
RXD[7:0]
0x00
H0
R
Bits 15
–
8
Reserved
Bits 7
–
0
RXD[7:0]
The receive data buffer can be read through these bits. The receive data buffer consists of a
2-byte FIFO, and older received data is read first.
Summary of Contents for S1C31D50
Page 461: ...25 1 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 25 Package TQFP12 48PIN ...
Page 462: ...25 2 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP13 64PIN ...
Page 463: ...25 3 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 TQFP14 80PIN ...
Page 464: ...25 4 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP15 100PIN ...