Fujitsu MB90335 Series Hardware Manual page 403

CHAPTER 17 EXTENDED I/O SERIAL INTERFACE
17.3 Operation of Extended I/O Serial Interface
●
For instruction shift in external shift clock mode (LSB first)
In instruction shift, when "1" is written to the PDR6:P64, "H" is output, and when "0" is written, "L" is
output (where external shift clock mode is selected, and SCOE=0).
Figure 17.3-5 When Instruction Shift is Performed in the External Shift Clock Mode.
SCK
STRT
BUSY
SOT
●
Stop by STOP=1 (LSB first, At internal clock)
Figure 17.3-6 Stop Timing when STOP Bit is Assumed to be "1"
SCK
(Transfer start)
STRT
BUSY
STOP
SOT
■ Operation during Transfer Serial Data
During transferring serial data, data from the serial output pin (SOT) is output on the falling edge of the
shift clock, data of the serial input pin (SIN) is input on the rising edge.
●
LSB first (when BDS bit is set to "0")
SCK
SIN
SOT
●
MSB first (when BDS bit is set to "1")
SCK
SIN
SOT
382
PDR6:P64=0
When MODE = 0
DO6
MODE=0
DO3
Figure 17.3-7 Shift Timing of I/O (LSB First)
DI0 DI1 DI2
SOT Output
DO0 DO2
DO1
Figure 17.3-8 Shift Timing of I/O (LSB First)
DI7 DI6 DI5
SOT Output
DO7 DO6 DO5
FUJITSU MICROELECTRONICS LIMITED
PDR6:P64=0
PDR6:P64=1
(Transfer end)
(Transfer complete)
DO4 DO5
SIN Input
DI3 DI4
DI5
DO3 DO4
DO5
SIN Input
DI4 DI3
DI2
DO4 DO3
DO2
MB90335 Series
(Data hold)
DO7
"1" Output
(Data hold)
DI6 DI7
DO6 DO7
DI1 DI0
DO1 DO0
CM44-10137-6E