iicbus.4

.\" Copyright (c) 1998, Nicolas Souchu
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"
.\" $FreeBSD$
.Dd August 6, 1998
.Dt IICBUS 4
.Os FreeBSD
.Sh ̾��
.Nm iicbus
.Nd
I2C �Х������ƥ�
.Sh ��
.Cd "controller iicbus0"
.Cd "controller iicbb0"
.Pp
.Cd "device iic0 at iicbus?"
.Cd "device ic0 at iicbus?"
.Cd "device iicsmb0 at iicbus?"
.Sh ����
�͡��� I2C �ǥХ��������椷��� I2C ����ȥ���������Ѥ���
�ɥ饤�Ф�������뤿�ᡢ
.Em iicbus
�����ƥ�ϡ�
ñ����֤ǡ��⥸�塼�벽���줿��
�������ƥ�����˰�¸���ʤ������ƥ���󶡤��ޤ���
.Sh I2C
I2C ����������ϩ�Х� (Inter Integrated Circuit bus) ��ά�ΤǤ���
I2C �Х��� Philips semiconductors �ˤ�ä� 1980 ǯ��ν���˳�ȯ����ޤ�����
������Ū�� TV ���åȤˤ�����
CPU �ȼ��ե��åפ���³���ưפˤ��뤿��Τ�ΤǤ�����
.Pp
�Х���ʪ��Ū�ˤϡ�
2 �ĤΥ����ƥ��֥磻��� 1 �ĤΥ����ɤؤ���³���鹽������ޤ���
�����ƥ��֥磻��Ǥ��� SDA �� SCL �Ϥɤ�����������Τ�ΤǤ���
SDA �� ���ꥢ��ǡ����饤��Ǥ��ꡢSCL �ϥ��ꥢ�륯���å��饤��Ǥ���

�Х�����³����뤹�٤ƤΥ���ݡ��ͥ�Ȥϡ�
���줬 CPU��LCD �ɥ饤�С�����⤷����ʣ���ʵ�ǽ����ä����åפǤ���С�
��ˡ����ʥ��ɥ쥹������ޤ���
�����γơ��Υ��åפϡ����ε�ǽ�˱����ơ�
����¦�Ȥ��Ƥ�����¦�Ȥ��Ƥ� (�ޤ�����ξ���Ȥ��Ƥ�)
ư��뤳�Ȥ��Ǥ��ޤ���
���餫�� LCD �ɥ饤�Фϼ���¦�����Ǥ��礦����
����� I/O ���åפ�����¦�ȼ���¦��ξ���ˤʤ�Ǥ��礦��
����� 1 �İʾ�ΥХ��ޥ�����¸�ߤ��ޤ���

�Х��ޥ����ϥХ����̿���ȯ�Ԥ�����åפǤ���
I2C �ץ��ȥ�����ͤǤϡ�
�Х���Υǡ���ž���򳫻Ϥ����� IC ���Х��ޥ����Ǥ���Ȥ���Ƥ��ޤ���
���λ����Ǥϡ����Ƥ�¾�Υ���ݡ��ͥ�ȤϥХ����졼�֤Ȥߤʤ���ޤ���
���Ǥ˽Ҥ٤��褦�ˡ�IC �Х��ϥޥ���ޥ����Х��Ǥ���
����ϥǡ���ž���򳫻Ϥ����뤳�ȤΤǤ��� IC ��
1 �İʾ���³���뤳�Ȥ��Ǥ��뤳�Ȥ��̣���Ƥ��ޤ���
.Sh �ǥХ���
�����Ĥ��� I2C �ǥХ����ɥ饤�Ф����Ѳ�ǽ�Ǥ���
.Pp
.Bl -column "�ǥХ���" -compact
.It Em �ǥХ��� Ta Em ����
.It Sy iic Ta "���̤� I/O ���"
.It Sy ic Ta "�ͥåȥ�� IP ���󥿥ե�����"
.It Sy iicsmb Ta "I2C ���� SMB �ؤΥ��եȥ������֥�å�"
.El
.Sh ���󥿥ե�����
I2C �ץ��ȥ���ϥϡ��ɥ������ˤ�äƤ⥽�եȥ������ˤ�äƤ�
�������뤳�Ȥ��Ǥ��ޤ���
���եȥ��������󥿥ե������ϡ�
�̾�� 2 �Ĥ��񹳤ˤ�äƶ�ư����� 2 �ܤο���������ʤ�
����ñ��ʥϡ��ɥ������ˤΤ߰�¸���Ƥ��ޤ���
�ϡ��ɥ��������󥿥ե������Ϥ�äȥ���ƥꥸ����Ȥʤ�ΤǤ��ꡢ
I2C �ץ��ȥ���ˤ������äƥХ��˽񤫤줿 8 �ӥå�ʸ���ǡ�����������ޤ���

I2C ���󥿥ե������ϥХ���ǥ��졼�֥ǥХ����Ȥ��ƿ����񤦤��Ȥ��Ǥ���
I2C �ץ��ȥ���Υޥ���ޥ���ǽ�ϤΤ�������
��ưŪ���������̿���Ԥ����Ȥ��Ǥ��ޤ���

�����Ĥ��� I2C ���󥿥ե����������Ѳ�ǽ�Ǥ���
.Pp
.Bl -column "���󥿥ե�����" -compact
.It Em ���󥿥ե����� Ta Em ����
.It Sy pcf Ta "Philips PCF8584 �ޥ���/���졼�֥��󥿥ե�����"
.It Sy iicbb Ta "���ѥӥå����ޥ������ѥɥ饤��"
.It Sy lpbb Ta "�ѥ���ݡ������ѥӥå����󥿥ե�����"
.It Sy bktr Ta "Brooktree848 �ӥǥ����åץ��å�, �ϡ��ɥ���������ӥ��եȥ������ޥ������ѥ��󥿥ե�����"
.El
.Sh ��Ϣ����
.Xr pcf 4 ,
.Xr iicbb 4 ,
.Xr lpbb 4
.Sh ���
.Nm
�ޥ˥奢��ڡ�����
.Fx 3.0
�Ǻǽ���о줷�ޤ�����
.Sh ���
���Υޥ˥奢��ڡ�����
.An Nicolas Souchu
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