SH7721 datasheet(799/1524 Pages) RENESAS

799 / 1524 page

Section 22

Analog Front End Interface (AFEIF)

Rev. 3.00 Jan. 18, 2008 Page 737 of 1458

REJ09B0033-0300

22.3.1

AFEIF Control Register 1 and 2 (ACTR1, ACTR2)

ACTR is the control register for AFEIF and is composed of ACTR1 and ACTR2. ACTR1 is

mainly used for FIFO control commands. ACTR2 is used for AFE control commands and DAA

control commands.

• ACTR1

Bit

Bit Name

Initial Value

R/W

Description

R/W

AFE Hardware Control

This bit controls AFE. AFE_HC1 signal is made

to high directly often the next serial transmit data

transfer, when this bit is written to 1. Then ACDR

data (AFE control word) is transferred by

founding the second AFE.FS. AFEIF module

automatically makes AFE_HC1 signal to low and

HC bit to 0, directly after transferring the AFE

control word. See section 22.4.2, AFE Interface

for more detail about AFE control sequences.

14 to 8



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

DLB

R/W

FIFO Digital Loop Back

0: Normal operation

1: Digital loop back between transmit FIFO and

receive FIFO is performed. In this time the

transmit data is output to AFE_TXOUT, too.

6, 5



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

FFSZ2

FFSZ1

FFSZ0

R/W

FIFO Interrupt Size Set 2 to 0

Specifies the size of FIFO. FIFO size to generate

interrupt (TFE, RFF, THE, and RHF) is assigned

as listed in table 22.2.

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