Notes: 1. The setting should be made so that the error is not more than 1%.
2. The value set in BRR is given by the following equation:
N =
OSC
— 1
(64
×
2
2n
×
B)
where
B: Bit rate (bit/s)
N: Baud rate generator BRR setting (0
≤
N
≤
255)
OSC: Value of ø
OSC
(Hz)
n: Baud rate generator input clock number (n = 0, 2, or 3)
(The relation between n and the clock is shown in table 10-4.)
3. The error in table 10-3 is the value obtained from the following equation, rounded to
two decimal places.
Error (%) =
B (rate obtained from n, N, OSC) — R(bit rate in left-hand column in table 10-3.)
×
100
R (bit rate in left-hand column in table 10-3.)
Table 10-4 Relation between n and Clock
SMR Setting
n
Clock
CKS1
CKS0
0
ø
0
0
0
ø
w
/2
*
1
/ø
w
*
2
0
1
2
ø/16
1
0
3
ø/64
1
1
Notes: 1.
ø w/2 clock in active (medium-speed/high-speed) mode and sleep mode
2.
ø w clock in subactive mode and subsleep mode
3.
In subactive or subsleep mode, SCI3 can be operated when CPU clock is øw/2
only.
265