ml670100 Oki Semiconductor, ml670100 Datasheet - Page 137

• Manufacturer Part Number: ml670100
• Description: Ml670100 Is A High-performance 32-bit Microcontroller
• Manufacturer: Oki Semiconductor

9.2.2
CSI Shift Registers 0,1 (CSInSFT, n=0,1)
CSI Shift Register n (CSInSFT, n=0,1) is an 8-bit read/write register that holds and shifts
transmitted and received data for Clock Synchronous Serial Interface n (CSIn, n=0,1).
After a system reset, this register contains an indeterminate value.
In master mode, the program writes data to this register to enable a transfer. The serial port
then uses the synchronization clock signal to transmit the register contents one bit at a time
starting from the least significant bit (LSB) to the CSIn_TXD (n=0,1) pin and replace that bit
with the input from the CSIn_RXD (n=0,1) pin.
When the 8-bit transfer is complete, the serial port stops the synchronization clock output and
generates a transfer complete interrupt request n (CSINTn, n=0,1). The register contents
remain valid until the start of the next transfer operation.
In slave mode, the program writes data to this register to enable a transfer. The serial port then
uses the synchronization clock input from the CSIn_SCLK (n=0,1) pin to transmit the register
contents one bit at a time starting from the least significant bit (LSB) to the CSIn_TXD (n=0,1)
pin and replace that bit with the input from the CSIn_RXD (n=0,1) pin.
When the 8-bit transfer is complete, the serial port generates a transfer complete interrupt
request n (CSINTn, n=0,1). The register contents remain valid until the program writes to this
register.
7
6
5
4
3
2
1
0
Figure 9.3 : CSI Shift Register n (CSInSFT, n=0,1)
9-5