Nuvoton NuMicro ML51 Series, Technical Reference Manual, Page: 479 / 719

ML51/ML54/ML56
Sep. 01, 2020 Page 479 of 719 Rev 2.00
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Manual
auto-reload mode (Mode 2). If using Timer 3 as the baud rate generator, its interrupt should also be
disabled.
Following shows all UART mode and baudrate fomula:
Mode
SM0 / SM1
(SCON[7:6])
SM2
(SCON[5])
SMOD
(PCON[7])
Frame
Bits
Baud Rate
0 00
0
- 8
FSYS divided by 12
1 FSYS divided by 2
1 01 -
0
10
Time1
TM1 (CKCON[3]) = 0
 
TH1 - 256 12
F
32
1
SYS


Time1
TM1 (CKCON[3]) = 1
 
TH1 - 256
F
32
1
SYS

Timer 3
 
RL3) RH3 (256 - 65536 scale - Pre
F
32
1
SYS
  

1
Time1
TM1 (CKCON[3]) = 0
 
TH1 - 256 12
F
16
1
SYS


Time1
TM1 (CKCON[3]) = 1
 
TH1 - 256
F
16
1
SYS

Timer 3  
RL3) RH3 (256 - 65536 scale - Pre
F
16
1
SYS
  

2 10 -
0
11
FSYS divided by 64
1 FSYS divided by 32
3 11 -
0
11
Time 1
TM1 (CKCON[3]) = 0
 
TH1 - 256 12
F
32
1
SYS


Time 1
TM1 (CKCON[3]) = 1
 
TH1 - 256
F
32
1
SYS

Timer 3
 
RL3) RH3 (256 - 65536 scale - Pre
F
32
1
SYS
  

1
Time1
TM1 (CKCON[3]) = 0
 
TH1 - 256 12
F
16
1
SYS


Time1
TM1 (CKCON[3]) = 1
 
TH1 - 256
F
16
1
SYS

Timer 3  
RL3) RH3 (256 - 65536 scale - Pre
F
16
1
SYS
  

Note: Timer 1 should configured as a timer in auto-reload mode (Mode 2).
Table 6.9-1 Serial Port 0 Mode / baud rate Description