HMS81C2012A Datasheet, PDF (68/107 Pages) List of Unclassifed Manufacturers – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

HMS81C2012A/2020A
14.1 Transmission/Receiving Timing
The serial transmission is started by setting SIOST(bit1 of
SIOM) to “1”. After one cycle of SCK, SIOST is cleared
automatically to “0”. The serial output data from 8-bit shift
register is output at falling edge of SCLK. And input data
is latched at rising edge of SCLK pin. When transmission
clock is counted 8 times, serial I/O counter is cleared as
‘0”. Transmission clock is halted in “H” state and serial I/
O interrupt(IFSIO) occurred.
SIOST
SCLK [R53]
(POL=0)
SOUT [R55]
SIN [R54]
(IOSW=0)
IOSWIN [R55]
(IOSW=1)
SIOSF
(SPI Status)
SPIIF
(SPI Int. Req)
D0
D1
D2
D3
D4 D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
Figure 14-3 SPI Timing Diagram at POL=0
SIOST
SCLK [R53]
(POL=1)
SOUT [R55]
SIN [R54]
(IOSW=0)
IOSWIN [R55]
(IOSW=1)
SIOSF
(SPI Status)
SPIIF
(SPI Int. Req)
64
D0
D1
D2
D3
D4 D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
Figure 14-4 SPI Timing Diagram at POL=1
SEP. 2004 Ver 2.00