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Chapter 12
Serial Interface Function
Preliminary User’s Manual U14913EE1V0UM00
(2)
Serial clock generation
A serial clock can be generated according to the settings of the CKSRm and BRGCm registers.
The basic clock to the 8-bit counter is selected according to the TPS3 to TPS0 bits of the CKSRm
register.
The 8-bit counter divisor value can be set according to the MDL7 to MDL0 bits of the BRGCm reg-
ister (m = 0 to 2).
(a) Clock select registers 1 to 3 (CKSR1 to CKSR3)
The CKSRm register is an 8-bit register for selecting the basic block according to the TPS3 to TPS0
bits. The clock selected by the TPS3 to TPS0 bits becomes the basic clock (Clock) of the transmis-
sion/ reception module. Its frequency is referred to as f
CLK
.
This register can be read or written in 8-bit or 1-bit units.
Figure 12-17: Clock Select Registers 1 to 3 (CKSR1 to CKSR3)
7
6
5
4
3
2
1
0
Address
Initial
value
CKSR0
0
0
0
0
TPS3
TPS2
TPS1
TPS0
FFFFFA06H
00H
7
6
5
4
3
2
1
0
Address
Initial
value
CKSR1
0
0
0
0
TPS3
TPS2
TPS1
TPS0
FFFFFA16H
00H
7
6
5
4
3
2
1
0
Address
Initial
value
CKSR2
0
0
0
0
TPS3
TPS2
TPS1
TPS0
FFFFFA26H
00H
Bit Position
Bit Name
Function
3 to 0
TPS3 to
TPS0
Specifies the basic clock
TPS3
TPS2
TPS1
TPS0
Basic Clock (f
CLK
)
0
0
0
0
f
CPU
/2
0
0
0
1
f
CPU
/4
0
0
1
0
f
CPU
/8
0
0
1
1
f
CPU
/16
0
1
0
0
f
CPU
/32
0
1
0
1
f
CPU
/64
0
1
1
0
f
CPU
/128
0
1
1
1
f
CPU
/256
1
0
0
0
f
CPU
/512
1
0
0
1
f
CPU
/1024
1
0
1
0
f
CPU
/2048
1
0
1
1
f
CPU
/4096
1
1
Arbitrary Arbitrary
Setting prohibited
Remark:
f
CPU
: Internal system clock.
Содержание V850E/CA1 ATOMIC
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