M68HC08 datasheet(189/288 Pages) FREESCALE

189 / 288 page

Multi-Master IIC Interface (MMIIC)

MC68HC908BD48 — Rev. 2.1

Data Sheet

Freescale Semiconductor

Multi-Master IIC Interface (MMIIC)

189

If the calling master does not return an acknowledge bit (MMRXAK = 1),

the module will release the SDA line for master to generate a "stop" or

"repeated start" condition. The data in the MMDTR will not be transferred

to the output circuit until the next calling from a master. The transmit

buffer empty flag remains cleared (MMTXBE = 0).

In master mode, the data in MMDTR will be transferred to the output

circuit when:

•

the module receives an acknowledge bit (MMRXAK = 0), after

setting master transmit mode (MMRW = 0), and the calling

address has been transmitted; or

•

the previous data in the output circuit has be transmitted and the

receiving slave returns an acknowledge bit, indicated by a

received acknowledge bit (MMRXAK = 0).

If the slave does not return an acknowledge bit (MMRXAK = 1), the

master will generate a "stop" or "repeated start" condition. The data in

the MMDTR will not be transferred to the output circuit. The transmit

buffer empty flag remains cleared (MMTXBE = 0).

The sequence of events for slave transmit and master transmit are

illustrated in Figure 14-7.

14.5.6 Multi-Master IIC Data Receive Register (MMDRR)

When the MMIIC module is enabled, MMEN = 1, data in this read-only

In slave mode, the data in MMDRR is:

Address:

$004F

Bit 7

654321

Bit 0

Read: MMRD7

MMRD6

MMRD5

MMRD4

MMRD3

MMRD2

MMRD1

MMRD0

Write:

Reset:

00000000

= Unimplemented

Figure 14-6. Multi-Master IIC Data Receive Register (MMDRR)

M68HC08 Datasheet(PDF) 189 Page - Freescale Semiconductor, Inc

M68HC08 Datasheet(HTML) 189 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL