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Bit 3—Clock Source Select 3 (CKS3): Bit 3 selects the clock source and sets pin SCK
input or output pin.
Bit 3: CKS3
0
1
Bits 2 to 0—Clock Select 2 to 0 (CKS2 to CKS 0): When CKS3 = 0, bits 2 to 0 select the
prescaler division ratio and the serial clock cycle.
Bit 2: CKS2
Bit 1: CKS1
0
0
1
1
0
1
Serial Control/Status Register 1 (SCSR1)
Bit
Initial value
Read/Write
Note: * Only a write of 0 for flag clearing is possible.
SCSR1 is an 8-bit read/write register indicating operation status and error status.
Upon reset, SCSR1 is initialized to H'9C.
Bit 7—Reserved Bit: Bit 7 is reserved; it is always read as 1, and cannot be modified.
214
Description
Clock source is prescaler S, and pin SCK
Clock source is external clock, and pin SCK
Bit 0: CKS0
0
1
0
1
0
1
0
1
7
6
—
SOL
ORER
1
0
—
R/W
R/(W)*
Prescaler Division
ø/1024 (initial value)
ø/256
ø/64
ø/32
ø/16
ø/8
ø/4
ø/2
5
4
—
—
0
1
—
—
is output pin
1
is input pin
1
Serial Clock Cycle
ø = 5 MHz
204.8 µs
51.2 µs
12.8 µs
6.4 µs
3.2 µs
1.6 µs
0.8 µs
—
3
2
—
—
1
1
—
R
as an
1
(initial value)
ø = 2.5 MHz
409.6 µs
102.4 µs
25.6 µs
12.8 µs
6.4 µs
3.2 µs
1.6 µs
0.8 µs
1
0
STF
0
0
R/W
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