Bit
Bit
Number
Mnemonic Description
Reserved
3-0
-
The value read from these bits is always 0. Do not set these bits.
Reset Value = 1000 0000b
Table 233. PSISTH Register
PSISTH (1.ACh) – PSI Host Status Register
7
6
5
4
3
2
1
0
PSHBSY
PSSTH6
PSSTH5
PSSTH4
PSSTH3
PSSTH2
PSSTH1
PSSTH0
Bit
Bit
Number
Mnemonic Description
Interface Busy Flag
Host Access (Read with SA0 = H)
Copy of the PSBSY flag.
7
PSHBSY
Software Access
Always returned as logic 0.
Can not be written by software.
7-bit Host Status Data
6-0
PSSTH6:0
Set by software to report status to the host.
Reset Value = 0000 0000b
Table 234. PSIDAT Register
PSIDAT (1.AFh) – PSI Data Register
7
6
5
4
3
2
1
0
PSD7
PSD6
PSD5
PSD4
PSD3
PSD2
PSD1
PSD0
Bit
Bit
Number
Mnemonic Description
Data Bits
7-0
PSD7:0
Reading this register returns the data written by the host in the FIFO.
Writing this register set data in the FIFO read later by the host.
Reset Value = 0000 0000b
212
AT85C51SND3Bx
7632A–MP3–03/06
ATMEL [ ATMEL ]
