AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 112
AT83C51SND1C_03
Manufacturer Part Number
AT83C51SND1C_03
Description
Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT83C51SND1C_03.pdf
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Response Token Format
112
AT8xC51SND1C
Table 105. Command Token Format
There are five types of response tokens (R1 to R5). As shown in Figure 76, responses
have a code length of 48 bits or 136 bits. A response 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 low level on MCMD line for a
response token (card to host) and succeeded (R1,R2,R4,R5) or not (R3) by a 7 - bit
CRC.
Response content contains mirrored command and status information (R1 response),
CID register or CSD register (R2 response), OCR register (R3 response), or RCA regis-
ter (R4 and R5 response).
Figure 76. Response Token Format
Table 106. R1 Response Format (Normal Response)
Table 107. R2 Response Format (CID and CSD registers)
Bit Position
Width (Bits)
Description
Bit Position
Width (bits)
Description
Bit Position
Description
Width (bits)
Value
Value
R1, R4, R5
Value
R3
R2
Start bit
Start bit
47
47
‘0’
‘0’
0
0
0
1
1
Start bit
135
‘0’
0
0
0
1
Transmission
Transmission
Total Length = 48 bits
Total Length = 48 bits
46
46
‘1’
bit
bit
‘0’
1
1
Transmission
Content
134
‘0’
bit
1
Content
Content = CID or CSD
Total Length = 136 bits
Command
Command
45:40
45:40
Index
Index
6
6
-
-
[133:128]
Reserved
‘111111’
CRC
6
Card Status
Argument
39:8
39:8
32
32
-
-
1
1
Argument
[127:1]
32
-
CRC7
CRC7
7:1
7:1
7
7
-
-
CRC
4109E–8051–06/03
End bit
End bit
End bit
0
‘1’
1
1
0
‘1’
‘1’
0
1
1
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