Datasheet

179
4341H–MP3–10/07
AT8xC51SND2C/MP3B
Table 20-4. SBUF Register
SBUF (S:99h) – Serial Buffer Register
Reset value = XXXX XXXXb
Table 20-5. SADDR Register
SADDR (S:A9h) – Slave Individual Address Register
Reset Value = 0000 0000b
Table 20-6. SADEN Register
SADEN (S:B9h) – Slave Individual Address Mask Byte Register
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
SD7 SD6 SD5 SD4 SD3 SD2 SD1 SD0
Bit Number
Bit
Mnemonic Description
7 - 0 SD7:0
Serial Data Byte
Read the last data received by the serial I/O Port.
Write the data to be transmitted by the serial I/O Port.
7 6 5 4 3 2 1 0
SAD7 SAD6 SAD5 SAD4 SAD3 SAD2 SAD1 SAD0
Bit Number
Bit
Mnemonic Description
7 - 0 SAD7:0 Slave Individual Address
7 6 5 4 3 2 1 0
SAE7 SAE6 SAE5 SAE4 SAE3 SAE2 SAE1 SAE0
Bit Number
Bit
Mnemonic Description
7 - 0 SAE7:0 Slave Address Mask Byte