User’s Manual
C166S V1 SubSystem
Asynchronous/Synchronous Serial Interface (ASC)
User’s Manual
10-19
V 1.6, 2001-08
Figure 10-9
ASC Baudrate Generator Circuitry in Asynchronous Modes
Using the fixed Input Clock Divider
The baudrate for asynchronous operation of serial channel ASC when using the fixed
input clock divider ratios (CON_FDE=0) and the required reload value for a given
baudrate can be determined by the following formulas:
Table 10-1
Asynchronous Baudrate Formulas using the Fixed Input Clock
Dividers
FDE
BRS
BG
Formula
0
0
0 ... 8191
1
÷
16
÷
2
f
clk
Baud
Rate
Clock
Sample
Clock
R
13-Bit Reload Register
13-Bit Baudrate Timer
÷
3
Fractional
Divider
Mux
FDE
BRS
)'(
BRS
Selected Divider
0
0
÷
2
0
1
÷
3
1
X
Fractional Divider
f
DIV
f
BRT
f
BR
32 x (BG+1)
Baudrate =
f
clk
32 x Baudrate
f
clk
BG =
- 1
48 x (BG+1)
Baudrate =
f
clk
48 x Baudrate
f
kw_clk
BG =
- 1
Содержание C166S V1 SubSystem
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Страница 452: ...User s Manual C166S V1 SubSystem General Purpose Timer Unit User s Manual 12 44 V 1 6 2001 08...
Страница 454: ...User s Manual C166S V1 SubSystem Instruction Index User s Manual 13 2 V 1 6 2001 08...
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