BAT32G1x9 user manual | Chapter 19 Universal serial communication unit
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Rev.1.02
(1) Register settings
Fig19-60
3 wire serial I/O (SSPI00, SSPI01, SSPI10, SSPI11, SSPI20, SSPI21, SSPI30, SSPI31)
Example of register settings for Slave transmit and receive
(a) serial mode register mn (SMRmn)
(b) serial communication operation configuration registermn
mn(SCRmn)
(c) serial data regsiter mn (SDRmn) (low 8 bit: SIOp)
(d) serial output register m(SOm)
...Only configure bit of target
channel
(e) serial output enable registerm (SOEm)
only set bit of target channel to 1.
(f) serial channel start register m (SSm)
Only set bit of target channel to 1.
channel n operational clock
(
fMCK
)
0: SPSm register configured pre-scaler output clock CKm0
1: SPSm register configured pre-scaler output clock CKm1
interrupt source of channel n
0: Transmit completion interrupt
1: Buffer empty interrupt
data transmit sequence selection
0: perform MSB first input/output
1: perform LSB first input/output
data length configuration
0: 7 bit data length
1: 8 bit data length
data and clock phase selection (details refer to
"19.3 control universal serial communication unit
registers)
SIOp
Note
baud rate configuration
configuration of transmit data/received data register
Note
This example is the setting method for SCI0. The data length of SCI1/SCI2 and the serial data register SDRmn are set
differently from this example.
For data length settings, refer to Chapter 19.3.4
For the setting method of serial data register SDRmn, refer to "19.3.6Serial data register mn(SDRmn)
Note that the SIOp register must be set to send data before the master device starts to output the clock.
Remark1.m: unit number (m=0
~
2) n: channel number (n=0
~
3) p: SSPI number (p=00, 01, 10, 11, 20, 21,
30, 31)
mn=00
~
03, 10
~
11, 20
~
21
2. : Fixed setting in
SSPI
Slave transmit and receive modes. : Cannot be set
(initial value is set).
×: This is a bit that cannot be used in this mode (and the initial value is set if it is not used in other modes).
0/1: Set "0"
or
"
1
"
according to the user's purpose.