M68HC08 datasheet(181/288 Pages) FREESCALE

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Multi-Master IIC Interface (MMIIC)

MC68HC908BD48 — Rev. 2.1

Data Sheet

Freescale Semiconductor

Multi-Master IIC Interface (MMIIC)

181

14.5 Registers

Six registers are associated with the Multi-master IIC module, they are

outlined in the following sections.

Table 14-2. MMIIC I/O Register Summary

Addr.

Bit 7

654321

Bit 0

$004A

Multi-Master IIC

Master Control Register

(MIMCR)

Read:

MMALIF MMNAKIF

MMBB

MMAST

MMRW

MMBR2

MMBR1

MMBR0

Write:

Reset:

00000000

$004B

Multi-Master IIC

Address Register

(MMADR)

Read:

MMAD7

MMAD6

MMAD5

MMAD4

MMAD3

MMAD2

MMAD1 MMEXTAD

Write:

Reset:

10100000

$004C

Multi-Master IIC

Control Register

(MMCR)

Read:

MMEN

MMIEN

MMTXAK

000

Write:

Reset:

00000000

$004D

Multi-Master IIC

Status Register

(MMSR)

Read: MMRXIF MMTXIF MMATCH MMSRW MMRXAK

MMTXBE MMRXBF

Write:

Reset:

00001010

$004E

Multi-Master IIC

Data Transmit Register

(MMDTR)

Read:

MMTD7

MMTD6

MMTD5

MMTD4

MMTD3

MMTD2

MMTD1

MMTD0

Write:

Reset:

11111111

$004F

Multi-Master IIC

Data Receive Register

(MMDRR)

Read: MMRD7

MMRD6

MMRD5

MMRD4

MMRD3

MMRD2

MMRD1

MMRD0

Write:

Reset:

00000000

= Unimplemented

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