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Transmission Bit Count and First Transfer Bit
In transmission, when the transfer bit count is from 1 to 7 bits, the method for data storage to the transmission data
buffer differs depending on the first transfer bit. When MSB is the first bit, store data to use the upper bits of
SC2TB. As in Figure: 13.3.1, if data "A" to "F" is stored in bp2 to bp7of SC2RB when transfer bit count is 6, data
is transferred from "F" to "A" in order. When LSB is the first bit , store data to use the lower bits of SC2TB. As in
Figure: 13.3.2, if data "A to "F" are stored in bp0 to bp5 of SC2TB when the transfer bit is 6, data is transferred
from "A" to "F" in order.
SC2TB
Figure:13.3.1 Transmission Bit Count and First Transfer Bit (MSB First)
SC2TB
Figure:13.3.2 Transmission Bit Count and First Transfer Bit (LSB First)
Reception Bit Count and First Transfer Bit
In reception, when the transfer bit is from 1 to 7 bits, the method for data storage to the reception data buffer
SC2RB differs depending on the first transfer bit. At MSB first, data is stored in the lower bits of SC2RB. When
transfer bit count is 6, data "A" to "F" is stored in bp0 to bp5 of SC2RB, data is transferred from "F" to "A" in
order as shown in Figure: 13.3.3. At LSB first, data is stored in the upper bits of SC2RB. When transfer bit count
is 6, , if data "A" to "F" is stored in bp2 to bp7 of SC2RB, data is transferred from "A" to "F" in order as shown in
Figure: 13.3.4.
Figure:13.3.3 Reception Bit Count and First Transfer Bit (MSB First)
Figure:13.3.4 Reception Bit Count and First Transfer Bit (LSB First)
7
6
F
E
7
6
7
6
SC2RB
7
6
SC2RB
F
E
5
4
3
2
D
C
B
A
5
4
3
2
F
E
D
C
5
4
3
2
A
B
C
D
5
4
3
2
D
C
B
A
1
0
1
0
B
A
1
0
E
F
1
0
Operation
Chapter 13
Serial Interface 2
XIII - 13
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