AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 127
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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4109E–8051–06/03
Table 115. MMSTA Register
MMSTA (S:DEh Read Only) – MMC Control and Status Register
Reset Value = 0000 0000b
Number
7 - 6
Bit
7
-
5
4
3
2
1
0
Mnemonic Description
CRC16S
RESPFS
CBUSY
CRC7S
CFLCK
DATFS
Bit
6
-
-
Reserved
The value read from these bits is always 0. Do not set these bits.
Card Busy Flag
Set by hardware when the card sends a busy state on the data line.
Cleared by hardware when the card no more sends a busy state on the data line.
CRC16 Status Bit
Transmission mode
Set by hardware when the token response reports a good CRC.
Cleared by hardware when the token response reports a bad CRC.
Reception mode
Set by hardware when the CRC16 received in the data block is correct.
Cleared by hardware when the CRC16 received in the data block is not correct.
Data Format Status Bit
Transmission mode
Set by hardware when the format of the token response is correct.
Cleared by hardware when the format of the token response is not correct.
Reception mode
Set by hardware when the format of the frame is correct.
Cleared by hardware when the format of the frame is not correct.
CRC7 Status Bit
Set by hardware when the CRC7 computed in the response is correct.
Cleared by hardware when the CRC7 computed in the response is not correct.
This bit is not relevant when CRCDIS is set.
Response Format Status Bit
Set by hardware when the format of a response is correct.
Cleared by hardware when the format of a response is not correct.
Command FIFO Lock Bit
Set by hardware to signal user not to write in the transmit command FIFO: busy
state.
Cleared by hardware to signal user the transmit command FIFO is available: idle
state.
CBUSY
5
CRC16S
4
DATFS
3
AT8xC51SND1C
CRC7S
2
RESPFS
1
CFLCK
0
127
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