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Mini57
Apr. 06, 2017
Page 347 of 475
Rev.1.00
MINI5
7
S
E
RI
E
S
TECH
NIC
A
L R
E
F
E
RE
N
CE
MA
N
UA
L
Supports master or slave mode operation (the maximum frequency for Master =
f
PCLK
/
2, for Slave <
f
PCLK
/ 5)
Configurable bit length of a transfer word from 4 to 16-bit
Supports one transmit buffer and two receive buffers for data payload
Supports MSB first or LSB first transfer sequence
Supports Word Suspend function
Supports 3-wire, no slave select signal, bi-direction interface
Supports wake-up function by slave select signal in Slave mode
6.13.3 Block Diagram
Peripheral
Device
User
Interface
Control Register
Data
Buffer
Data
Shift
Unit
SPI Protocol
Processor
Unit
Input
Processor
Buffer
Control
Interrupt
Generation
USCIx_DAT0/1
To Interrupt
Signal
USCIx_CLK
USCIx_CTL0
Wake-up
Control
Protocol-Relative
Clock Generator
f
PCLK
Output
Configuration
Note:
x = 0, 1
Figure 6.13-3 USCI - SPI Mode Block Diagram
6.13.4 Basic Configuration
The basic configurations of USCI0 for SPI mode are as follows.
USCI0 pins are configured in SYS_GPA_MFP, SYS_GPC_MFP, and SYS_GPD_MFP
registers.
Enable USCI0 peripheral clock in USCI0CKEN (CLK_APBCLK[24]).
Reset USCI0 controller in USCI0RST (SYS_IPRST1[24]).
The basic configurations of USCI1 for SPI mode are as follows:
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