HD64F2149YV datasheet(522/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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522 / 1075 page

Section 16 I

2C Bus Interface

Rev. 3.00 Jan 18, 2006 page 494 of 1044

REJ09B0280-0300

• Direct bus drive (with SCL and SDA pins)

 Two pins—P52/SCL0 and P97/SDA0—(normally NMOS push-pull outputs) function as

NMOS open-drain outputs when the bus drive function is selected.

 Two pins—P86/SCL1 and P42/SDA1—(normally CMOS pins) function as NMOS-only

outputs when the bus drive function is selected.

• Automatic switching from formatless mode to I2C bus format (channel 0 only)

 Formatless operation (no start/stop conditions, non-addressing mode) in slave mode

 Operation using a common data pin (SDA) and independent clock pins (VSYNCI, SCL)

 Automatic switching from formatless mode to I2C bus format on the fall of the SCL pin

16.1.2

Block Diagram

Figure 16.1 shows a block diagram of the I

2C bus interface.

Figure 16.2 shows an example of I/O pin connections to external circuits. Channel 0 I/O pins and

channel 1 I/O pins differ in structure, and have different specifications for permissible applied

voltages. For details, see section 25, Electrical Characteristics.

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