170
CHAPTER 14 SERIAL INTERFACE UART
Figure 14-4. Baud Rate Generator Control Register (BRGC) Format
Address: FF87H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
BRGC
0
TPS2
TPS1
TPS0
MDL3
MDL2
MDL1
MDL0
(f
X
= 8.38 MHz)
TPS2
TPS1
TPS0
Source Clock Selection for 5-bit Counter
n
0
0
0
f
X
/2
1
0
0
1
f
X
/2
2
2
0
1
0
f
X
/2
3
3
0
1
1
f
X
/2
4
4
1
0
0
f
X
/2
5
5
1
0
1
f
X
/2
6
6
1
1
0
f
X
/2
7
7
1
1
1
f
X
/2
8
8
MDL3
MDL2
MDL1
MDL0
Input Clock Selection for Baud Rate Generator
k
0
0
0
0
f
SCK
/16
0
0
0
0
1
f
SCK
/17
1
0
0
1
0
f
SCK
/18
2
0
0
1
1
f
SCK
/19
3
0
1
0
0
f
SCK
/20
4
0
1
0
1
f
SCK
/21
5
0
1
1
0
f
SCK
/22
6
0
1
1
1
f
SCK
/23
7
1
0
0
0
f
SCK
/24
8
1
0
0
1
f
SCK
/25
9
1
0
1
0
f
SCK
/26
10
1
0
1
1
f
SCK
/27
11
1
1
0
0
f
SCK
/28
12
1
1
0
1
f
SCK
/29
13
1
1
1
0
f
SCK
/30
14
1
1
1
1
Setting prohibited
—
Cautions 1. Writing to BRGC during a communication operation may cause abnormal output from
the baud rate generator and disable further communication operations. Therefore, do
not write to BRGC during a communication operation.
2. Bit 7 must be set to 0.
Remarks 1. f
SCK
: Source clock for 5-bit counter
2. n
: Value set via TPS0 to TPS2 (1
≤
n
≤
8)
3. k
: Value set via MDL0 to MDL3 (0
≤
k
≤
14)
Содержание mPD780973 Series
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