BAT32G1x9 user manual | Chapter 19 Universal serial communication unit
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Rev.1.02
(1) Register settings
Fig19-22: 3 wire serial I/O (SSPI00, SSPI01, SSPI10, SSPI11, SSPI20, SSPI21, SSPI30, SSPI31)
Example of register setting content when the master sends
(a) serial mode register mn (SMRmn)
(b) serial communication operation configuration registermn mn(SCRmn)
(c) serial data registermn mn(SDRmn)
(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 registerm (SSm)
only set bit of target channel to 1.
channel n operational clock
（
f
MCK
）
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)
when clock phase is "positive phase" (CKPmn of SCRmn register as 0),
"1" means starting communication; when clock phase is "inverted
phase" (CKPmn=1), "0" means starting communication.
SIOp
baud rate configuration (operation clock
(fmck) scaling configuration )
transmit data (configuration of transmit data)
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
Note 1.m: Unit number (m=0~2)n: Channel number (n=0~3)mn=00~ 03, 10
～
11, 20
～
21
2.
: Cannot be set
(set initial value). 0/1
: Set
"0"
or
"
1
"
according to the user's purpose.
