SH7721 datasheet(670/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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670 / 1524 page

Section 18

Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Jan. 18, 2008 Page 608 of 1458

REJ09B0033-0300

Bit rate (bits/s)

SCBRR setting for baud rate generator

Asynchronous mode: 0

≤ N ≤ 255

Synchronous mode: 1

≤ N ≤ 255

φ:

Peripheral module operating frequency (MHz)

Baud rate generator input clock (n = 0 to 3)

(See the table below for the relation between n and the clock.)

SCSMR Settings

Clock Source

CKS1

CKS0

φ/4

φ/16

φ/64

Find the bit rate error in asynchronous mode by the following formula:

1. When sampling rate is 1/16

Error (%) =

φ × 106

(1+N)

× B × 32 × 22n-1

- 1

× 100

2. When sampling rate is 1/5

Error (%) =

φ × 106

(1+N)

× B × 10 × 22n-1

- 1

× 100

3. When sampling rate is 1/11

Error (%) =

φ × 106

(1+N)

× B × 22 × 22n-1

- 1

× 100

4. When sampling rate is 1/13

Error (%) =

φ × 106

(1+N)

× B × 26 × 22n-1

- 1

× 100

5. When sampling rate is 1/27

Error (%) =

φ × 106

(1+N)

× B × 58 × 22n-1

- 1

× 100

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