upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 429

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

Remarks: 1. The reception accuracy is dependent upon the number of bits in 1 frame, input clock fre-
Therefore, the maximum receivable baud rate on the transmission side is as follows.
Similarly, the permissible maximum transfer rate can be calculated as follows.
The minimum receivable baud rate on the transmission side is as follows.
The permissible error of the baud rate from the transmission side of UARTAn can be calculated by
the above expressions of the minimum/maximum baud rate. The result is as shown in Table 12-6.
2. k: Set value of UAnCTL2 (n = 0 to 1)
quency, and division ratio (k). The higher the input clock frequency and the higher the
division ratio (k), the higher the accuracy.
Table 12-6: Permissible Maximum/Minimum Baud Rate Error
Division Ratio
Chapter 12 Asynchronous Serial Interface A (UARTA)
100
255
(k)
20
50
8
10
11
× FLmax = 11 × FL –
User’s Manual U16702EE3V2UD00
BRmax = (FLmin/11)
BRmin = (Flmax/11)
Permissible Maximum
FLmax =
Baud Rate Error
+3.53%
+4.26%
+4.56%
+4.66%
+4.72%
21k- 2
20k
-1
2 × k
k + 2
-1
=
=
FL × 11
21k + 2
21k - 2
20k
× FL =
22k
Permissible Minimum
Baud Rate Error
Brate
Brate
21k- 2
2 × k
–3.61%
–4.31%
–4.58%
–4.67%
–4.73%
FL
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