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TMP86FS49AIUG Datenblatt(PDF) 197 Page - Toshiba Semiconductor

Teilenummer TMP86FS49AIUG
Bauteilbeschribung  8 Bit Microcontroller
PDF  296 Pages
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Hersteller  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMP86FS49AIUG Datenblatt(HTML) 197 Page - Toshiba Semiconductor

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TMP86FS49AIUG
(2)
External clock
When an external clock is selected by setting SIO2CR<SCK> to “111B”, the clock via the SCK2
pin from an external source is used as the serial clock.
To ensure shift operation, the serial clock pulse width must be 4/fc or more for both “H” and “L”
levels.
Figure 15-3 External Clock
15.3.1.2 Shift edge
The leading edge is used to transmit data, and the trailing edge is used to receive data.
(1)
Leading edge shift
Data is shifted on the leading edge of the serial clock (falling edge of the SCK2 pin input/output).
(2)
Trailing edge shift
Data is shifted on the trailing edge of the serial clock (rising edge of the SCK2 pin input/output).
Figure 15-4 Shift Edge
tSCKL
tSCKH
tSCKL, tSCKH > 4/fc
SCK2
pin
7*******
********
Bit7
Shift out
***01234
**012345
*0123456
Bit5
Bit6
Bit5
Bit6
Bit7
67******
567*****
(a) Leading edge shift (Example of MSB transfer)
(b) Trailing edge shift (Example of MSB transfer)
01234567
****0123
*****012
******01
*******0
********
Bit4
4567****
34567***
234567**
1234567*
01234567
Bit4
Bit3
Bit2
Bit1
Bit0
Bit3
Bit2
Bit1
Bit0
SIO2CR<SIOS>
SCK2
pin
Shift register
SO2 pin
Shift register
SCK2
pin
SI2 pin
SIO2CR<SIOS>



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