MG74PG1A08 Datasheet, PDF (82/127 Pages) Megawin Technology Co., Ltd – Interrupt controller

16.5. Baud Rate Setting
Bits T1X12 and URM0X3 in AUXR2 register provide a new option for the baud rate setting, as listed below.
16.5.1. Baud Rate in Mode 0
Figure 16–8. Mode 0 baud rate equation
Mode 0 Baud Rate =
F_SYSCLK
n
; n=12, if URM0X3=0
; n=4, if URM0X3=1
Note:
If URM0X3=0, the baud rate formula is as same as standard 8051.
Table 16–1. Serial Port Mode 0 baud rate example
SYSCLK URM0X3 Mode 0 Baud Rate
12MHz
0
1M bps
12MHz
1
3M bps
24MHz
0
2M bps
24MHz
1
6M bps
16.5.2. Baud Rate in Mode 2
Figure 16–9. Mode 2 baud rate equation
Mode 2 Baud Rate =
2^SMOD1 X 2^{(SMOD2 X 2)}
64
X F_SYSCLK
Note:
If SMOD2=0, the baud rate formula is as same as standard 8051. If SMOD2=1, there is an enhanced function
for baud rate setting. Table 16–2 defines the Baud Rate setting with SMOD2 factor in Mode 2 baud rate
generator.
Table 16–2. Serial Port Mode 2 baud rate example
SYSCLK SMOD2 SMOD1 Mode 2 Baud Rate
12MHz
0
0
187.5K bps
12MHz
0
1
375K bps
12MHz
1
0
750K bps
12MHz
1
1
--
Note
Default Baud Rate, standard
Double Baud Rate, standard
Double Baud Rate X2, enhanced
Reserved
82
MG74PG1A08 Data Sheet
MEGAWIN