M32C83T datasheet(331/527 Pages) RENESAS

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Page 308

21. Intelligent I/O (Group 0, 1 Communication Function)

)

(

Figure 21.44 IECR and IEAR Registers

Group 2 IEBus Control Register

Symbol

Address

After Reset

IECR

017216

00XX X0002

Bit Name

Function

Bit

Symbol

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

0 : Idle state

1 : Busy state (start condition is detected)

IEB

IETS

IEBBS

(b5 - b3)

IEBus Enable Bit(1)

IEBus Transmit Start

Request Bit

Digital Filter

Select Bit

0 : Transmission is completed

1 : Transmission is started

0 : Disables IEBus(2)

1 : Enables IEBus

0 : No digital filter

1 : Digital filter

IEM

IEBus Busy Flag

IEBus Mode

Select Bit

0 : Mode 1

1 : Mode 2

NOTES:

1. Set the IEB bit while the base timer clock is stopped.

2. After the IEB bit is set to "0", keep "0" for at least 1 fBT2 cycle. Set the BCK1 to BCK0 bits in the

G2BCR0 register to "002" (clock stop) when setting the IEB bit to "1".

Group 2 IEBus Address Register

Symbol

Address

After Reset

IEAR

017116 - 017016

Indeterminate

Function

Address data

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

Address data

b15

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