SH7721 datasheet(776/1524 Pages) RENESAS

776 / 1524 page

Section 21

Serial I/O with FIFO (SIOF)

Rev. 3.00 Jan. 18, 2008 Page 714 of 1458

REJ09B0033-0300

(2)

Frame Length

The length of the frame to be transferred by the SIOF is specified by the FL3 to FL0 bits in

SIMDR. Table 21.5 shows the relationship between the FL3 to FL0 bit settings and frame length.

Table 21.5

Frame Length

FL3 to FL0

Slot Length

Number of Bits in a Frame

Transfer Data

00xx

8-bit monaural data

0100

8-bit monaural data

0101

8-bit monaural data

0110

8-bit monaural data

0111

128

8-bit monaural data

10xx

16-bit monaural data

1100

16-bit monaural/stereo data

1101

16-bit monaural/stereo data

1110

128

16-bit monaural/stereo data

1111

256

16-bit monaural/stereo data

Note:

x: Don't care.

(3)

Slot Position

The SIOF can specify the position of transmit data, receive data, and control data in a frame

(common to transmission and reception) by slot numbers. The slot number of each data is

specified by the following registers.

• Transmit data: SITDAR

• Receive data: SIRDAR

• Control data: SICDAR

Only 16-bit data is valid for control data. In addition, control data is always assigned to the same

slot number both in transmission and reception.

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