Rainbow Electronics AT89C5132 - Manual (Page 98)

98
AT8xC5132
4173A–8051–08/02
Registers Table 94. MMCON0 Register
MMCON0 (S:E4h) – MMC Control Register 0
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
DRPTR DTPTR CRPTR CTPTR MBLOCK DFMT RFMT CRCDIS
Bit
Number
Bit
Mnemonic Description
7 DRPTR
Data Receive Pointer Reset Bit
Set to reset the read pointer of the data FIFO.
Clear to release the read pointer of the data FIFO.
6 DTPTR
Data Transmit Pointer Reset Bit
Set to reset the write pointer of the data FIFO.
Clear to release the write pointer of the data FIFO.
5 CRPTR
Command Receive Pointer Reset Bit
Set to reset the read pointer of the receive command FIFO.
Clear to release the read pointer of the receive command FIFO.
4 CTPTR
Command Transmit Pointer Reset Bit
Set to reset the write pointer of the transmit command FIFO.
Clear to release the read pointer of the transmit command FIFO.
3 MBLOCK
Multi-block Enable Bit
Set to select multi-block data format.
Clear to select single block data format.
2 DFMT
Data Format Bit
Set to select the block-oriented data format.
Clear to select the stream data format.
1 RFMT
Response Format Bit
Set to select the 48-bit response format.
Clear to select the 136-bit response format.
0 CRCDIS
CRC7 Disable Bit
Set to disable the CRC7 computation when receiving a response.
Clear to enable the CRC7 computation when receiving a response.