HD6433832S Datasheet, PDF (243/560 Pages) Renesas Technology Corp – single-chip microcomputers

Bits 7 and 6—Operation Mode Select 1, 0 (SNC1, SNC0): Bits 7 and 6 select the operation
mode.
Bit 7: SNC1
Bit 6: SNC0
Description
0
0
8-bit synchronous transfer mode
1
16-bit synchronous transfer mode
1
0
Continuous clock output mode*¹
1
Reserved*²
Notes: 1. Pins SI₁ and SO₁ should be used as general input or output ports.
2. Don’t set bits SNC1 and SNC0 to 11.
(initial value)
Bits 5 and 4—Reserved Bits: Bits 5 and 4 are reserved, but they can be written and read.
Bit 3—Clock Source Select 3 (CKS3): Bit 3 selects the clock source and sets pin SCK₁ as an
input or output pin.
Bit 3: CKS3
0
1
Description
Clock source is prescaler S, and pin SCK₁ is output pin
Clock source is external clock, and pin SCK₁ is input pin
(initial value)
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
0
1
Bit 1: CKS1
0
1
0
1
Bit 0: CKS0
0
1
0
1
0
1
0
1
Prescaler Division
φ/1024 (initial value)
φ/256
φ/64
φ/32
φ/16
φ/8
φ/4
φ/2
Serial Clock Cycle
φ = 5 MHz φ = 2.5 MHz
204.8 µs
409.6 µs
51.2 µs
102.4 µs
12.8 µs
25.6 µs
6.4 µs
12.8 µs
3.2 µs
6.4 µs
1.6 µs
3.2 µs
0.8 µs
1.6 µs
—
0.8 µs
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