H838532H datasheet(325/508 Pages) RENESAS

325 / 508 page

Section 10 Serial Communication Interface

Rev. 1.00 May 30, 2008 Page 305 of 484

REJ09B0436-0100

Table 10.3

Examples of BRR Settings for Various Bit Rates (Asynchronous Mode) (2)

OSC

10 MHz

16 MHz

Bit Rate

(bit/s)

Error

(%)

Error

(%)

110

-0.25 2

141 0.03

150

0.16

103 0.16

200

-0.35 2

0.16

250

0.16

-0.79

300

—

0.16

600

—

0.16

1200

129 0.16

207 0.16

2400

0.16

103 0.16

4800

—

0.16

9600

—

0.16

19200

—

0.16

31250

38400

—

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:

OSC

N =

(64

× 22n × B)

– 1

where B:

Bit rate (bit/s)

Baud rate generator BRR setting (0

≤ N ≤ 255)

OSC: Value of

OSC (Hz)

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.

B (rate obtained from n, N, OSC) — R(bit rate in left-hand column in table 10.3.)

Error (%) =

R (bit rate in left-hand column in table 10.3.)

× 100

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