SH7058 Datasheet, PDF (526/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

B:
Bit rate (bits/s)
N:
Baud rate generator BRR setting (0 ≤ N ≤ 255)
Pf:
Peripheral module operating frequency (MHz) (1/2 of system clock)
n:
Baud rate generator input clock (n = 0 to 3)
(See the following table for the clock sources and value of n.)
SMR Settings
n
Clock Source
CKS1
CKS2
0
Pφ
0
0
1
Pφ/4
0
1
2
Pφ/16
1
0
3
Pφ/64
1
1
The bit rate error in asynchronous mode is calculated as follows:
Error
(%)
=



(N
+
Pφ
1) • B
•
•
10⁶
64 •
2^2n–1
–1
• 100
Table 15.5 indicates the maximum bit rates in asynchronous mode when the baud rate generator is
being used for various frequencies. Tables 15.6 and 15.7 show the maximum rates for external
clock input.
Table 15.5 Maximum Bit Rates for Various Frequencies with Baud Rate Generator
(Asynchronous Mode)
Pφ (MHz)
10
11.0592
12
12.288
14
14.7456
16
17.2032
18
18.432
19.6608
20
Maximum Bit Rate (Bits/s)
n
312500
0
345600
0
375000
0
384000
0
437500
0
460800
0
500000
0
537600
0
562500
0
576000
0
614400
0
625000
0
Settings
N
0
0
0
0
0
0
0
0
0
0
0
0
Rev. 3.0, 09/04, page 485 of 1086