upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 301

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Remark
Baud rate error tolerance (when k = 16) =
16
32
75
76
256
1200
2400
4800
9600
19200
31250
38400
76800
125000
150000
262000
300000
524000
1250000
Baud
(bps)
Rate
Basic timing
(clock cycle T)
High-speed clock
(clock cycle T’)
enabling normal
reception
Low-speed clock
(clock cycle T”)
enabling normal
reception
Remark
255
244
244
208
206
244
208
208
208
104
52
32
26
13





k
8
fxx: Main clock oscillation frequency
f
XX
= 2 MHz





m
9
8
7
6
6
4
2
1
0
0
0
0
0
0
0
Figure 10-30. Error Tolerance (When k = 16), Including Sampling Errors
T: 8-bit counter’s source clock cycle
−4.26
−0.20
Error
0.06
0.06
0.16
0.06
0.16
0.16
0.16
0.16
0.16
0.00
0.16
0.16
0.00
(%)
Table 10-8. Relationship Between Main Clock and Baud Rate





START
START
START
255
255
218
216
128
217
218
218
218
109
f
67
55
27
17
14




XX
k
8
30.45T
CHAPTER 10
33.55T
32T
= 4.194 MHz




m
9
8
7
7
6
3
2
1
0
0
0
0
0
0
0
0
D0
D0
D0
−1.32
Error
(%)
−0.71
0.39
0.38
0.20
0.01
0.20
0.20
0.20
0.20
0.20
0.16
1.13
0.14
0.05
User’s Manual U12768EJ4V1UD
−0.20
±15.5




60.9T
320
67.1T
64T
SERIAL INTERFACE FUNCTION
255
218
216
128
217
218
218
218
218
134
110
f


54
34
28
16
14

XX
8
k
× 100 = 4.8438 (%)
256T
D7
= 8.388 MHz



m
9
8
8
7
4
3
2
1
0
0
0
0
0
0
0
0
0
D7
−0.20
−1.32
−0.14
Error
−0.71
0.38
0.20
0.01
0.20
0.20
0.20
0.20
0.20
0.16
1.13
0.14
0.05
0.05
(%)



288T
D7
P
221
218
130
221
221
221
221
221
136
221
111
301.95T
sampling
68
55
32
28
16



k
7
304.5T
f
304T
Ideal
point
XX
P
15.5T
STOP
= 17 MHz



m
9
9
8
5
4
3
2
1
1
0
0
0
0
0
0
0
0
320T
P
15.5T
STOP
−0.29
−2.86
Error
0.20
−0.23
−1.18
0.16
0.16
0.16
0.16
0.16
0.16
0.00
0.16
0.00
0.62
1.38
1.38
(%)
335.5T



336T
STOP
Sampling error
0.5T
255
152
130
130
130
130
130
160
130
130
80
67
38
33
19




k
8
352T
f
XX
= 20 MHz




m
9
8
6
5
4
3
2
1
1
0
0
0
0
0
0
0
−0.50
Error
(%)
0.78
0.39
0.16
0.16
0.16
0.16
0.16
0.00
0.16
0.16
0.00
0.44
1.01
0.44
0.00




301