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385
Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(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
register (m = 0, 1).
(a) Clock select registers (CHKSR0, CHKSR1)
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
transmission/ 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 13-17:
Clock Select Registers (CHKSR0, CHKSR1)
7
6
5
4
3
2
1
0
Address
Initial
value
CHKSR0
0
0
0
0
TPS3
TPS2
TPS1
TPS0
FFFF FA06H
00H
CHKSR1
0
0
0
0
TPS3
TPS2
TPS1
TPS0
FFFF FA46H
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
PCLK
0
0
0
1
f
PCLK
/2
0
0
1
0
f
PCLK
/4
0
0
1
1
f
PCLK
/8
0
1
0
0
f
PCLK
/16
0
1
0
1
f
PCLK
/32
0
1
1
0
f
PCLK
/64
0
1
1
1
f
PCLK
/128
1
0
0
0
f
PCLK
/256
1
0
0
1
f
PCLK
/512
1
0
1
0
f
PCLK
/1024
1
0
1
1
f
PCLK
/2048
1
1
Arbitrary Arbitrary
Setting
prohibited
Remark:
f
PCLK
: internal peripheral clock.
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