Chapter 13Serial Interface 2XIII - 26 Operation■ Setting Transfer Bit CountTransfer bit count is set automatically when a frame mode is specified with the SC2FM1-0 flags of the SC2CTR2register. When the SC2CMD flag of the SC2CTR1 register is set to “1” and UART communication is selected ,the setting in the synchronous serial transfer bit count selection flag SC2LNG2-0 f the SC2CTR0 registerbecomes invalid.■ Setting First Transfer BitRefer to :XIII-12■ Transmission Bit Count and First Transfer BItRefer to : XIII-13■ Reception Bit Count and First Transfer BItIn reception, when transfer bit count is 7, the data storing method to the reception data buffer SC2RB is differentdepending on start transfer bit specification . When “MSB first” is selected, data is stored in lower bits of SC2RB.When transfer bit count is 7, data “A” to “G” are stored in bp 7 to 1 of SC2RB from “A” to “G” in order as shownin Figure: 13.3.15. When “LSB first” is selected, data is stored in upper bits of SC2RB. When transfer bit count is7, data “A” to ”G” are stored in bp 6 to 0 of SC2RB from “A” to “G” in order as shown in Figure: 13.3.16.Figure:13.3.15 Reception Bit Count and First Transfer BIt (MSB first)Figure:13.3.16 Reception Bit Count and First Transfer BIt (LSB first)0124 3567SC2RB A B C D E F G0124 3567SC2RB ABCDEFG
