450
CHAPTER 19 SERIAL INTERFACE CHANNEL 2
The baud rate transmit/receive clock generated is either a signal scaled from the main system clock, or a signal
scaled from the clock input from the ASCK pin.
(a) Generation of baud rate transmit/receive clock by means of main system clock
The transmit/receive clocks generated by scaling the main system clock. The baud rate generated from
the main system clock is found from the following expression.
[Baud rate] = [Hz]
where,
f
X
: Main system clock oscillation frequency
f
XX
: Main system clock frequency (fx or fx/2)
n
: Value set in TPS0 to TPS3 (1
≤
n
≤
11)
k
: Value set in MDL0 to MDL3 (0
≤
k
≤
14)
Table 19-3. Relation between Main System Clock and Baud Rate
fx = 5.0 MHz
fx = 4.19 MHz
MCS = 1
MCS = 0
MCS = 1
MCS = 0
BRGC Set Value Error (%) BRGC Set Value Error (%) BRGC Set Value
Error (%) BRGC Set Value Error (%)
75
–
00H
1.73
0BH
1.14
EBH
1.14
110
06H
0.88
E6H
0.88
03H
–2.01
E3H
–2.01
150
00H
1.73
E0H
1.73
EBH
1.14
DBH
1.14
300
E0H
1.73
D0H
1.73
DBH
1.14
CBH
1.14
600
D0H
1.73
C0H
1.73
CBH
1.14
BBH
1.14
1200
C0H
1.73
B0H
1.73
BBH
1.14
ABH
1.14
2400
B0H
1.73
A0H
1.73
ABH
1.14
9BH
1.14
4800
A0H
1.73
90H
1.73
9BH
1.14
8BH
1.14
9600
90H
1.73
80H
1.73
8BH
1.14
7BH
1.14
19200
80H
1.73
70H
1.73
7BH
1.14
6BH
1.14
31250
74H
0
64H
0
71H
–1.31
61H
–1.31
38400
70H
1.73
60H
1.73
6BH
1.14
5BH
1.14
76800
60H
1.73
50H
1.73
5BH
1.14
—
—
Remark
MCS: Oscillation mode selection register bit 0
f
XX
2
n
×
(k+16)
Baud
Rate
(bps)
Содержание PD78052
Страница 2: ...2 MEMO ...
Страница 8: ...8 MEMO ...
Страница 16: ...16 MEMO ...
Страница 36: ...36 MEMO ...
Страница 158: ...158 MEMO ...
Страница 174: ...174 MEMO ...
Страница 240: ...240 MEMO ...
Страница 260: ...260 MEMO ...
Страница 340: ...340 MEMO ...
Страница 392: ...392 MEMO ...
Страница 438: ...438 MEMO ...
Страница 482: ...482 CHAPTER 20 REAL TIME OUTPUT PORT MEMO ...
Страница 510: ...510 MEMO ...
Страница 524: ...524 MEMO ...
Страница 560: ...560 MEMO ...
Страница 576: ...576 MEMO ...
Страница 598: ...598 MEMO ...
Страница 602: ...602 MEMO ...