Serial Port 0 Enhance Function - CMOSTEK CMT2380F17 Manual

Bit 3: T1X12, Timer 1 clock source selector while C/T=0.
0: Clear to select SYSCLK/12.
1: Set to select SYSCLK as the clock source. If set, the UART0 baud rate by Timer 1 in Mode 1 and Mode
3 is 12 times than standard 8051 function.。

AUXR3：Auxiliary Register 3
SFR Page = 0 only
SFR Address = 0xA4
Bit 7
Name
T0PS1
R/W R/W
Reset V alue 0
Bit 3: S0PS0, Serial Port 0 pin Selection 0. (S0PS1 at AUXR10.3)

AUXR6：Auxiliary Register 6
SFR Page = 3 only
SFR Address = 0xA4
Bit
7
Name KBI4PS1
R/W R/W
Reset V alue 0
Bit 1: SnMIPS, S0MI & S1MI Port pin Selection.

18.10 Serial Port 0 Enhance function

If SMOD3 (S0CFG.0) is set, SFR address 0xB9 will be accessed on S0CR1. S0CR1 control the
enhanced function of serial port 0 including :

Enable S0 embedded baud rate generator, S0BRG

Enable the S0 TX or RX to select the baud rate time base by S0BRG

Enable S0BRG to behave a general timer

Enable S0 to enter LIN bus mode

S0CR1：Serial Port 0 Control Register 1 (SMOD3 = 1)
SFR Page = 0~F
SFR Address = 0xB9
Bit 7
Name
S0TR
R/W R/W
Reset V alue 0
Bit 7: S0TR, UART0 Baud Rate Generator control bit. 0: Clear to stop S0BRG operation.
1: Set to start S0BRG operation.
Bit 6: S0TX12, S0BRG clock source selection.
0: Clear to select SYSCLK/12 as the clock source of S0BRG. 1: Set to select SYSCLK as the clock
source of S0BRG.
6 5
T0PS0 BPOC1
R/W R/W
0 0
S0PS1, S0PS0
00
01
10
11
6 5
KBI4PS0 KBI6PS0
R/W R/W
0 0
SnMIPS
0
1
6 5
S0TX12 S0TCK
R/W R/W
0 0
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4 3
BPOC0 S0PS0
R/W R/W
0 0
RxD0 TxD0
P3.0 P3.1
P4.4 P4.5
P3.1 P3.0
P1.7 P2.2
4 3
KBI2PS0 T3FCS
R/W R/W
0 0
S0MI S1MI
P1.6 P6.1
P3.3 P4.7
4 3
S0RCK S0CKOE
R/W R/W
0 0
CMT2380F17
2 1
TWIPS1 TWIPS0
R/W R/W
0 0
2 1
T2FCS SnMIPS
R/W R/W
0 0
2 1
ARTE --
R/W W
0 0
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0
T0XL
R/W
0
0
S0COPS
R/W
0
0
--
W
0