Section 10 Serial Communication Interface
Rev. 6.00 Aug 04, 2006 page 336 of 680
REJ09B0145-0600
Bit 3:
Clock source select 3 (CKS3)
Bit 3 selects the clock source to be supplied and sets the SCK
1
pin to input or output mode.
Bit 3
CKS3
Description
0
Clock source is prescaler S, SCK
1
is output pin
(initial value)
1
Clock source is external clock, SCK
1
is input pin
Bits 2 to 0:
Clock select 2 to 0 (CKS2 to CKS0)
When CKS3 is cleared to 0, bits 2 to 0 selects the prescaler division ratio and the serial clock
cycle.
Bit 2
Bit 1
Bit 0
Serial Clock Cycle
CKS2
CKS1
CKS0
Prescaler Division Ratio
φφφφ
= 2.5 MHz
0
0
0
φ
/1024 (initial value)
409.6 µs
0
0
1
φ
/256
102.4 µs
0
1
0
φ
/64
25.6 µs
0
1
1
φ
/32
12.8 µs
1
0
0
φ
/16
6.4 µs
1
0
1
φ
/8
3.2 µs
1
1
0
φ
/4
1.6 µs
1
1
1
φ
W
/4
122 µs
2. Serial Control Status Register 1 (SCSR1)
Bit
Initial value
Read/Write
7
—
1
—
6
SOL
0
R/W
5
ORER
0
R/(W)
*
4
—
1
—
3
—
1
—
0
STF
0
R/W
2
—
1
—
1
MTRF
0
R
Note:
*
Only a write of 0 for flag clearing is possible.
SCSR1 is an 8-bit register that indicates the operational and error status of SCI1.
Upon reset, SCSR1 is initialized to H'9C.
Содержание H8/38342
Страница 8: ...Rev 6 00 Aug 04 2006 page vi of xxxvi...
Страница 12: ...Rev 6 00 Aug 04 2006 page x of xxxvi...
Страница 38: ...Rev 6 00 Aug 04 2006 page xxxvi of xxxvi...
Страница 76: ...Section 1 Overview Rev 6 00 Aug 04 2006 page 38 of 680 REJ09B0145 0600...
Страница 240: ...Section 7 RAM Rev 6 00 Aug 04 2006 page 202 of 680 REJ09B0145 0600...
Страница 468: ...Section 12 A D Converter Rev 6 00 Aug 04 2006 page 430 of 680 REJ09B0145 0600...
Страница 580: ...Section 15 Electrical Characteristics Rev 6 00 Aug 04 2006 page 542 of 680 REJ09B0145 0600...