upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 300

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

300
(b) Baud rate
The transmit/receive clock for the baud rate to be generated is a signal generated by dividing the main clock.
•
•
<When 8 ≤ k ≤ 255>
Generation of baud rate transmit/receive clock using main clock
The transmit/receive clock is obtained by dividing the main clock. The following equation is used to obtain
the baud rate from the main clock.
Baud rate error tolerance
The baud rate error tolerance depends on the number of bits in a frame and the counter division ratio
[1/(16+k)].
Table 10-8 shows the relationship between the main clock and the baud rate, and Figure 10-30 shows an
example of the baud rate error tolerance.
[Baud rate] =
f
m:
k:
XX
:
Main clock oscillation frequency
Value set by TPS03 to TPS00 (0 ≤ m ≤ 9) – when UART0
Value set by TPS12 to TPS10 (0 ≤ m ≤ 5) – when UART1
Value set by MDLn7 to MDLn0 (8 ≤ k ≤ 255)
2
m+1
f
XX
× k
CHAPTER 10
[Hz]
User’s Manual U12768EJ4V1UD
SERIAL INTERFACE FUNCTION