11 UART (UART3)
11-10
Seiko Epson Corporation
S1C17M12/M13 TECHNICAL MANUAL
(Rev. 1.2)
Bits 1–0
CLKSRC[1:0]
These bits select the clock source of the UART3.
Table 11.8.1 Clock Source and Division Ratio Settings
UAnCLK.
CLKDIV[1:0] bits
UAnCLK.CLKSRC[1:0] bits
0x0
0x1
0x2
0x3
IOSC
OSC1
OSC3
EXOSC
0x3
1/8
1/1
1/8
1/1
0x2
1/4
1/4
0x1
1/2
1/2
0x0
1/1
1/1
(Note) The oscillation circuits/external input that are not supported in this IC cannot be
selected as the clock source.
Note: The UAnCLK register settings can be altered only when the UAnCTL.MODEN bit = 0.
UART3 Ch.
n
Mode Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
UAnMOD
15–13 –
0x0
–
R
–
12 PECAR
0
H0
R/W
11 CAREN
0
H0
R/W
10 BRDIV
0
H0
R/W
9
INVRX
0
H0
R/W
8
INVTX
0
H0
R/W
7
–
0
–
R
6
PUEN
0
H0
R/W
5
OUTMD
0
H0
R/W
4
IRMD
0
H0
R/W
3
CHLN
0
H0
R/W
2
PREN
0
H0
R/W
1
PRMD
0
H0
R/W
0
STPB
0
H0
R/W
Bits 15–13 Reserved
Bit 12
PECAR
This bit selects the carrier modulation period.
1 (R/W): Carrier modulation during H data period
0 (R/W): Carrier modulation during L data period
Bit 11
CAREN
This bit enables the carrier modulation function.
1 (R/W): Enable carrier modulation function
0 (R/W): Disable carrier modulation function
Bit 10
BRDIV
This bit sets the UART3 operating clock division ratio for generating the transfer (sampling) clock
using the baud rate generator.
1 (R/W): 1/4
0 (R/W): 1/16
Bit 9
INVRX
This bit enables the USIN
n
input inverting function.
1 (R/W): Enable input inverting function
0 (R/W): Disable input inverting function
Bit 8
INVTX
This bit enables the USOUT
n
output inverting function.
1 (R/W): Enable output inverting function
0 (R/W): Disable output inverting function
Bit 7
Reserved