Rainbow-electronics AT89C51SND1C Manual de usuario descargar pdf (Pagina 111)

111

AT8xC51SND1C

4109E–8051–06/03

Figure 71. (Multiple) Block Read Operation

As shown in Figure 72 and Figure 73 the data write operation uses a simple busy signal-

ling of the write operation duration on the data line (MDAT).

Figure 72. Sequential Write Operation

Figure 73. Multiple Block Write Operation

Figure 74. No Response and No Data Operation

Command Token Format As shown in Figure 75, commands have a fixed code length of 48 bits. Each command

token is preceded by a Start bit: a low level on MCMD line and succeeded by an End bit:

a high level on MCMD line. The command content is preceded by a Transmission bit: a

high level on MCMD line for a command token (host to card) and succeeded by a 7 - bit

CRC so that transmission errors can be detected and the operation may be repeated.

Command content contains the command index and address information or parameters.

Figure 75. Command Token Format

Data Block

MCMD

MDAT

Data Stop OperationBlock Read Operation

CRC

Multiple Block Read Operation

Command Response Command Response

Data Block CRC Data Block CRC

Stop Command

Data Stream

MCMD

MDAT

Data Stop OperationData Transfer Operation

Command ResponseCommand Response

Stop Command

Busy

MCMD

MDAT

Data Stop OperationBlock Write Operation

Multiple Block Write Operation

BusyData Block CRC Data Block CRC

Command Response Command Response

Stop Command

Status BusyStatus

CommandMCMD

MDAT

No Data OperationNo Response Operation

Command Response

Total Length = 48 bits

Content CRC1 1

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 209 210

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