CMT2380F17
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Table 18-1. SMOD2 application criteria in Mode 2
SMOD2
SMOD1
Baud Rate
Note
Recommended Max.
Receive Error (%)
0
0
Default Baud Rate
Standard function
3%
0
1
Double Baud Rate
Standard function
3%
1
0
Double Baud Rate
X2
Enhanced function
2%
1
1
Double Baud Rate
X4
Enhanced function
1%
Note: When Timer 1 in Double Baud Rate x4 (SMOD1=1 & SMOD2=1) mode, the TH1 can not equal to 254 &
255.
Table 18-2. S0 Mode 2 Baud Rates @ FSYSCLK=11.0592MHz
BaudRate
URM0X3
SMOD2
SMOD1
Error
172,800
0
0
0
0.0%
345,600
0
0
1
0.0%
691,200
0
1
0
0.0%
1,382,400
0
1
1
0.0%
57,600
1
0
0
0.0%
115,200
1
0
1
0.0%
230,400
1
1
0
0.0%
460,800
1
1
1
0.0%
Table 18-3. S0 Mode 2 Baud Rates @ FSYSCLK=12.00MHz
BaudRate
URM0X3
SMOD2
SMOD1
Error
187,500
0
0
0
0.0%
375,000
0
0
1
0.0%
750,000
0
1
0
0.0%
1,500,000
0
1
1
0.0%
62,500
1
0
0
0.0%
125,000
1
0
1
0.0%
250,000
1
1
0
0.0%
500,000
1
1
1
0.0%
18.7.4
Baud Rate in Mode 1 & 3
18.7.4.1 Using Timer 1 as the Baud Rate Generator
Mode 1, 3 Baud Rate =
32
X
F
SYSCLK
12 x (256
–
TH1)
; T1X12=0
or =
32
X
;
T1X12=1
F
SYSCLK
1
x (256
–
TH1)
2
SMOD1
X
2
(SMOD2 X 2)
2
SMOD1
X
2
(SMOD2 X 2)
Note:
If SMOD2=0, T1X12=0, the baud rate formula is as same as standard 8051. If SMOD2=1, there is an
enhanced function for baud rate setting. Table 18
–4 defines the Baud Rate setting with SMOD2 factor in
Timer 1 baud rate generator.
Table 18-4. SMOD2 application criteria in Mode 1 & 3 using Timer 1
Summary of Contents for CMT2380F17
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