Nuvoton NuMicro MS51PC0AE - Table 6.9-1 Serial Port UART0 Mode; Baudrate Description; Table 6.9-2 Serial Port UART1 Mode; Baudrate Description

MS51
Nov. 28, 2019 Page 367 of 491 Rev 1.00
MS51 32K SERIES TECHNICAL REFERENCE MANUAL
Note: Timer 1 should configured as a timer in auto-reload mode (Mode 2).
Table 6.9-1 Serial Port UART0 Mode / baudrate Description
Mode
Frame
Bits
SM0_1 / SM1_1
(S1CON[7:6])
SMOD_1
(T3CON[7])
Baud Rate
0
8
00
-
FSYS divided by 12
1
10
01
0
Timer 3
 
RL3)RH3(256-65536scale-Pre
F
32
1
SYS


1
Timer 3
 
RL3)RH3(256-65536scale-Pre
F
16
1
SYS


2
11
10
0
FSYS divided by 64
1
FSYS divided by 32
3
11
11
0
Timer 3
 
RL3)RH3(256-65536scale-Pre
F
32
1
SYS


1
Timer 3
 
RL3)RH3(256-65536scale-Pre
F
16
1
SYS


Table 6.9-2 Serial Port UART1 Mode / baudrate Description
Sample code: we list the most popular UART setting Mode 1 initial step as following：
Serial port 0 (UART0) use timer 1 as baudrate generator: Formula is
 
TH1-256
F
16
1
SYS

SCON = 0x50; //UART0 Mode1,REN=1,TI=1
TMOD |= 0x20; //Timer1 set to Mode2 auto reload mode (must)
PCON |= 0x80; //UART0 Double Rate Enable
CKCON |= 0x10; //Timer 1 as clock source
T3CON &= 0xDF; //Timer1 as UART0 clock source
TH1 = value;
TR1=1;
Serial port 0 (UART0) use Timer 3 as baudrate generator: Formula is
 
RL3)RH3(256-65536scale-Pre
F
16
1
SYS


SCON = 0x50; //UART0 Mode1,REN=1,TI=1
PCON |= 0x80; //UART0 Double Rate Enable
T3CON &= 0xF8; //(Prescale=1)
T3CON |= 0x20; //UART0 baud rate clock source = Timer3
RH3 = value high byte