TMP92CF30
2009-06-12
92CF30-466
(3-1) SPI Status Register (SPIST)
The SPIST register contains three bits that indicates the status of data communication.
SPIST Register
7
6
5
4
3
2
1
0
Bit
Symbol
TEMP TEND
REND
Read/Write
R
R
Reset State
1
1
0
SPIST
(0824H)
Function
Transmit
FIFO
Status
0: No empty
space
1: Has an
empty space
Transmission
Status
0:
Transmission
in progress
or having
transmit data
1:
Transmission
ended
Reception
Status
0: Reception
in progress
or not having
receive data
1: Reception
Ended or
FIFO full
15
14
13
12
11
10
9
8
Bit Symbol
Read/Write
Reset State
(0825H)
Function
Figure 3.17.9 SPIST Register
(a)
TEMP
For UNIT-mode transmission, this bit is cleared to “0” when the transmit register
(SPITD) contains valid data; otherwise, it is set to “1”.
For Sequential-mode transmission, this bit is set to “1” when the transmit FIFO
buffer contains no valid data.
(b)
TEND
This bit is cleared to “0” when the SPITD register or the transmit FIFO contains
valid transmit data, and also when the transmission is in progress. This bit is set to “1”
after completing the data transmission where the SPITD register and the transmit
FIFO contain no valid data.
(c)
REND
For UNIT-mode reception, this bit is set to “1” when completing the data reception
and valid data is stored into the receive data register (if there is any valid data). This
bit is cleared to “0” when the receive register (SPIRD) contains no valid data, or when
the reception is in progress.
For Sequential-mode reception, this bit is set to “1” when the 32-byte receive FIFO is
full with the valid data after completing the reception of the last data. This bit is
cleared to “0” when there is still an empty space of one byte or more in the FIFO.
The RFUL flag does not exist because its function is exactly the same as the REND
flag.
Содержание TLCS-900/H1 Series
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