AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 126

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

126
AT8xC51SND1C
Table 113. MMCON1 Register
MMCON1 (S:E5h) – MMC Control Register 1
Reset Value = 0000 0000b
Table 114. MMCON2 Register
MMCON2 (S:E6h) – MMC Control Register 2
Reset Value = 0000 0000b
Number
MMCEN
Number
BLEN3
7 - 4
Bit
Bit
4-3
2-1
7
7
3
2
1
0
7
6
5
0
Mnemonic Description
Mnemonic Description
RESPEN
DATD1:0
BLEN3:0
MMCEN
BLEN2
DATDIR
CMDEN
FLOWC
DATEN
DCR
DCR
CCR
Bit
Bit
6
6
-
Block Length Bits
Refer to Table 111 for bits description. Do not program value > 1011b
Data Direction Bit
Set to select data transfer from host to card (write mode).
Clear to select data transfer from card to host (read mode).
Data Transmission Enable Bit
Set and clear to enable data transmission immediately or after response has
been received.
Response Enable Bit
Set and clear to enable the reception of a response following a command
transmission.
MMC Clock Enable Bit
Set to enable the MCLK clocks and activate the MMC controller.
Clear to disable the MMC clocks and freeze the MMC controller.
Data Controller Reset Bit
Set and clear to reset the data line controller in case of transfer abort.
Command Controller Reset Bit
Set and clear to reset the command line controller in case of transfer abort.
Reserved
The value read from these bits is always 0. Do not set these bits.
Used to delay the data transmission after a response from 3 MMC clock periods
(all bits cleared) to 9 MMC clock periods (all bits set) by step of 2 MMC clock
periods.
MMC Flow Control Bit
Set to enable the flow control during data transfers.
Clear to disable the flow control during data transfers.
Command Transmission Enable Bit
Set and clear to enable transmission of the command FIFO to the card.
Data Transmission Delay Bits
BLEN1
CCR
5
5
BLEN0
4
4
-
DATDIR
3
3
-
DATEN
DATD1
2
2
RESPEN
DATD0
1
1
4109E–8051–06/03
CMDEN
FLOWC
0
0