CHAPTER 9 SERIAL INTERFACE 00
User's Manual U11919EJ3V0UM00
130
The baud rate transmit/receive clock to be generated is either a signal scaled from the 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 system clock
The transmit/receive clock is generated by scaling the system clock. The baud rate generated from the
system clock is found from the following expression.
[Baud rate] = [Hz]
f
X
: System clock oscillation frequency
n : Value determined by values of TPS000 through TPS003 as shown in Figure 9-6 (2
≤
n
≤
8)
Table 9-3. Example of Relationship between System Clock and Baud Rate
Error (%)
Baud Rate (bps)
n
BRGC00 Set Value
f
X
= 5.0 MHz
f
X
= 4.9152 MHz
1,200
8
70H
2,400
7
60H
4,800
6
50H
9,600
5
40H
19,200
4
30H
38,400
3
20H
76,800
2
10H
1.73
0
Caution
Be sure not to select n = 1 during an operation at f
X
= 5.0 MHz because n = 1 exceeds
the baud rate limit.
f
X
2
n + 1
×
8
Summary of Contents for mPD789026 Subseries
Page 2: ...User s Manual U11919EJ3V0UM00 2 MEMO...
Page 8: ...User s Manual U11919EJ3V0UM00 8 MEMO...
Page 12: ...User s Manual U11919EJ3V0UM00 12 MEMO...
Page 22: ...User s Manual U11919EJ3V0UM00 22 MEMO...
Page 32: ...User s Manual U11919EJ3V0UM00 32 MEMO...
Page 84: ...User s Manual U11919EJ3V0UM00 84 MEMO...
Page 92: ...User s Manual U11919EJ3V0UM00 92 MEMO...
Page 104: ...User s Manual U11919EJ3V0UM00 104 MEMO...
Page 166: ...User s Manual U11919EJ3V0UM00 166 MEMO...
Page 178: ...User s Manual U11919EJ3V0UM00 178 MEMO...
Page 184: ...User s Manual U11919EJ3V0UM00 184 MEMO...
Page 204: ...User s Manual U11919EJ3V0UM00 204 MEMO...
Page 206: ...User s Manual U11919EJ3V0UM00 206 MEMO...