CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
338
(4) Baud rate generator output clock selection register 4 (BRGCK4)
BRGCK4 is set by an 8-bit memory manipulation instruction.
RESET input sets BRGCK4 to 7FH.
Figure 10-53. Baud Rate Generator Output Clock Selection Register 4 (BRGCK4)
After reset: 7FH
R/W
Address: FFFFF2E8H
7
6
5
4
3
2
1
0
BRGCK4
0
BRGK6
BRGK5
BRGK4
BRGK3
BRGK2
BRGK1
BRGK0
BRGK6
BRGK5
BRGK4
BRGK3
BRGK2
BRGK1
BRGK0
Baud rate output clock
k
0
0
0
0
0
0
0
Setting prohibited
0
0
0
0
0
0
0
1
f
SCK
/2
1
0
0
0
0
0
1
0
f
SCK
/4
2
0
1
0
3
0
1
1
f
SCK
/6
3
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
1
1
0
f
SCK
/252
126
1
1
1
1
1
1
1
f
SCK
/254
127
The baud rate transmit/receive clock that is generated is obtained by dividing the main clock.
•
Generation of baud rate transmit/receive clock using main clock
The transmit/receive clock is obtained by dividing the main clock. The following equation is used to
obtain the baud rate from the main clock.
<When 1
≤≤≤≤
k
≤≤≤≤
127>
[Baud rate] = [Hz]
f
XX
: Main clock oscillation frequency
n:
Value set by BRGN2 to BRGN0 (0
≤
n
≤
7)
k:
Value set by BRGK7 to BRGK0 (1
≤
k
≤
127)
Caution Do not use the baud rate transmit/receive clock of CSI4 with the transfer rate higher than
the CPU operation clock. If used with the transfer rate higher than the CPU operation
clock, transfer cannot be performed correctly.
f
xx
2
n
×
k
×
2
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