AT89C51SND1C-7HTUL Atmel, AT89C51SND1C-7HTUL Datasheet - Page 112

• Manufacturer Part Number: AT89C51SND1C-7HTUL
• Description: IC MCU 64KB FLASH MEM 81-CBGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND1C-7HTUL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 44
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 81-CBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

16.2.3
Figure 16-6. Command Token Format
16.2.4
112
AT8xC51SND1C
Command Token Format
Response Token Format
As shown in Figure 16-6, 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.
Table 106. Command Token Format
There are five types of response tokens (R1 to R5). As shown in Figure 16-7, 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 regis-
ter or CSD register (R2 response), OCR register (R3 response), or RCA register (R4 and R5
response).
Figure 16-7. Response Token Format
R1, R4, R5
Bit Position
Width (Bits)
Description
Value
0
R3
R2
1
0
0
0
Start bit
Total Length = 48 bits
0
0
0
47
‘0’
1
Content
Total Length = 48 bits
Total Length = 48 bits
Transmission
Content
46
‘1’
bit
1
Content
Content = CID or CSD
Total Length = 136 bits
CRC
Command
45:40
Index
6
-
1
CRC
Argument
1
1
39:8
32
-
CRC7
7:1
7
-
CRC
4109L–8051–02/08
1
End bit
‘1’
0
1