Toshiba H1 Series - Manual (Page 495)

TMP92CZ26A
92CZ26A-492
(4) SPICR (SPI CRC Register)
CRC result of Transmit/Receive data is set to SPICR register.
SPICR Register
7 6 5 4 3 2 1 0
bit Symbol CRCD7 CRCD6 CRCD5 CRCD4 CRCD3 CRCD2 CRCD1 CRCD0
Read/Write R
After Reset 0 0 0 0 0 0 0 0
Function
CRC result register [7:0]
15 14 13 12 11 10 9 8
bit Symbol CRCD15 CRCD14 CRCD13 CRCD12 CRCD11 CRCD10 CRCD9 CRCD8
Read/Write R
After Reset 0 0 0 0 0 0 0 0
Function
CRC result register [15:8]
Figure 3.17.11 SPICR Register
(a) <CRCD15:0>
The result which is calculated according to the setting; SPICT<CRC16_7_b>,
<CRCRX_TX_B> and <CRCRESET_B>, are loaded to this register.
In case CRC16, all bits are valid.
In case CRC7, lower 7 bits are valid.
The flow will be showed to calculate CRC16 of received data for instance by flowchart.
Firstly, initialize CRC calculation register by writing <CRCRESET_B>= “1” after
setting <CRC16_7_b>= “1”, <CRCRX_TX_B>=”0”, <CRCRESET_B>= “0”.
Next, finish transmitting all bits to calculate CRC by writing data in SPITD register.
Please sense SPIST<TEND> to confirm whether receiving is finished.
If read SPICR register after finishing, CRC16 of received data can be read.
Note: CRC is generated in I/O point. Please take care soft ware process to compare the CRC when
used FIFO.
SPICR
(826H)
(827H)
SPITD
T
rans
mitt,Rec
eiv
e
ont
roller
SPDO
16bit
SPIRD
SPDI
DI
DO
100K
Ω
100K Ω
Internal dat
a b
u
s
TX FIFO
8
×32
RX FIFO
8
×32
16bit
RX shift re
gister
TX shft r
egi
ster
TMP92CZ26A SPI slave
CRC generation point